Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d510efaf5e17ad…

MALICIOUS

PDF

48.1 KB Created: 2020-08-23 08:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 580913d512826ee4b7ce77646a191532 SHA-1: 785107281f31736c54f12a99c34bb5a1f2a9abaf SHA-256: a8d510efaf5e17ad96aff92415203e89b8c8be5512b84c924aba34d6f2718b99
202 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=balancing+chemical+equations+worksheet', which is flagged as a malicious redirector. The presence of a 'Download Button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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=balancing+chemical+equations+worksheet In PDF document text
    • http://begupu.newwoodturners.org/uploads/1/3/2/7/132740267/zoboregekalamojaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2342/3912/files/penulabuguwutip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5373/6351/files/26761391286.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/pafuvavarefat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/chevy_cruze_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4655/1208/files/6th_grade_math_ratio_tables_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7872/9374/files/dubotosowigif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6412/1749/files/67622203552.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4459/2021/files/gadabivanut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/1533/9938/files/difuvefitejid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1790/4039/files/wojikusadudaxibokanalawo.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72C3 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off00007cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBD 5544 bytes
SHA-256: 730e8925fb04e4ea3270e758af431127d78ac8eabc97cb6ea543eed60c96a331
font_02_sfnt_off00008f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F73 9924 bytes
SHA-256: 70d576ffbaec3d5a35da8b300efd02d6218fd550bd4dca0e4b656374bc51aa29

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