Malicious PDF — malware analysis report

Static analysis result for SHA-256 401751bfb6a792f7…

MALICIOUS

PDF

42.7 KB Created: 2020-08-11 12:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3a262936f006ae7b041de6ea170e68fd SHA-1: 9b8ea1f47fb55db5b2d078a015dc391212994f09 SHA-256: 401751bfb6a792f765fe1a85899dc0b5a23509462917cd14ce6338094d977101
194 Risk Score

Malware Insights

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

The PDF document was identified as malicious due to a critical heuristic firing for linking to known malicious redirector infrastructure. It also contains a link farm with numerous embedded URLs, likely intended to distribute further malicious content or lead to spam pages. The primary malicious URL identified is https://ttraff.ru/pify?keyword=gym+training+book+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=gym+training+book+pdf In PDF document text
    • http://files.pleasantpointcommunitychurch.com/uploads/1/3/2/8/132815063/eed67.pdfIn PDF document text
    • http://files.sueheathscience.com/uploads/1/3/0/8/130814351/2cc3c369112f97.pdfIn PDF document text
    • http://files.kittymunger.com/uploads/1/3/0/7/130776745/suwevatapobasuv_lodemido_bemom_rabawopolojow.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/1/0437/8958/2487/files/best_video_downloader_chrome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/jubusafodis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7675/4344/files/98760275545.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8597/8013/files/ic_4017_pin_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3176/3864/files/pdf_file_reader_free_download_for_windows_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/coordinate_conjunctions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7827/1641/files/gifevirelofurisovepud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/10635479046.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9105/0137/files/44423914348.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 6

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69A1 5488 bytes
SHA-256: 5fca62731c412ee9037a06f6f4d1a09f132524027351112640223b0a1a3b9d72
font_01_sfnt_off00007c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C43 10060 bytes
SHA-256: 609dffb9e3dfa71c336be41f88cabfa3d588ce67bb70e6cbfc262f2766ac7cb0

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