Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1937c8c40fa8f9e…

MALICIOUS

PDF

89.6 KB Created: 2020-08-02 22:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e6c5e8cc3e3fcf0c8da21e6e10185059 SHA-1: d850e1411ae8f354ca1f6b5fe88cb81d170ab701 SHA-256: c1937c8c40fa8f9e28f01ae463d0c4ff9f11a3655200da5a20e32f3641fb8b0e
210 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm and a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains text that, when combined with the heuristics, suggests an advance-fee scam lure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=study+island+bot, which is likely used to redirect the user to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=study+island+bot In PDF document text
    • http://files.mountaingirlclay.com/uploads/1/3/0/8/130874101/6326877.pdfIn PDF document text
    • http://files.beulahmay.com/uploads/1/3/0/7/130775156/6502161.pdfIn PDF document text
    • http://files.thelanguagegarden.com/uploads/1/3/0/9/130969297/tizabavow-gijibowezelo-jadadus-borog.pdfIn PDF document text
    • http://files.snari.org/uploads/1/3/0/8/130873930/4922733.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4474/1024/files/83639329159.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4588/7905/files/digijaxun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0700/7127/files/26369226348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/bobs_burgers_season_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4471/6199/files/tesadupewujebalo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/rekutu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tikumakosesik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/72546613095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7614883084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/pijimagamovaxikepejavuwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4914/7803/files/memiwozofawovexebomuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/harbor_breeze_ceiling_fans.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3152/6561/files/42724658576.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 4832 bytes
SHA-256: 666d20d23442e478915317bc8cf130c1ed89cf66d0772ed73ce375ab05c41668
font_02_sfnt_off00011605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11605 3320 bytes
SHA-256: 5e9d354ea0df3bece425348fb25c31fab4003f9b67d6d06cafe1440e1608dc5e
font_03_sfnt_off00012353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 11432 bytes
SHA-256: ef1db3030b6584dcf27f32c142a8a960b4a206ce48f59a5ec179dc488cd8a73b
font_04_sfnt_off00014a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A22 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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