Malicious PDF — malware analysis report

Static analysis result for SHA-256 91418966d2168b69…

MALICIOUS

PDF

44.0 KB Created: 2020-08-22 06:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 64f04e1748a033ec004d67cedc8a697b SHA-1: b01c986e508c34dd6e2d381e3ba73b316ce027b6 SHA-256: 91418966d2168b69b1dd60a1b7af8ebbc0dc3a98c678832de180b38b4386449b
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to traff.ru, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics. The file is generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with the link farm heuristic.

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=esvs+guidelines+aortic+aneurysm In PDF document text
    • http://rivupa.higherlevelevents.co.uk/uploads/1/3/1/1/131164250/7367124.pdfIn PDF document text
    • http://files.bergenphotography.net/uploads/1/3/2/6/132682204/1172733.pdfIn PDF document text
    • http://gilir.questioncircumcision.com/uploads/1/3/1/1/131164110/rutidulanolu.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/1/0430/5338/3833/files/50584875963.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9434/3841/files/31471906547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6381/2004/files/package_mockup_design_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/60858869944.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/gezilizegujeka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/72487313350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1539/6776/files/root_software_for_android_5._0_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8417/5773/files/design_thinking_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0239/5798/files/been_or_gone_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/xirasexitabeluvupuseruk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/fedukelijopobozi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3059/4204/files/kofukefo.pdfIn PDF document text
    • https://medlineplus.gov/aorticaneurysm.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E59 5380 bytes
SHA-256: 12c81a761fdab8d72afc639fd6b27d3a7721f8665c1cbd4f66f98b624564fc17
font_01_sfnt_off00008098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8098 10048 bytes
SHA-256: d9d19a2bff67551c59259746181dff4344dd3246d1659378b73bb15cb5d61e6f

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