Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a581e9189fba533…

MALICIOUS

PDF

37.0 KB Created: 2020-08-21 23:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fcf5822d642957976157059f5be67903 SHA-1: 4d696fa787182febb252fcbe2b796038c7afc448 SHA-256: 2a581e9189fba533eb0c09713b922b8cecb4e3224529ac5cf28a31c7ffa734ac
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'parabola conic sections worksheet' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate it's a link farm designed to redirect users to harmful content.

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=parabola+conic+sections+worksheet In PDF document text
    • http://files.jsklar.com/uploads/1/3/0/8/130814055/sinoxilavem_tijifujijeg.pdfIn PDF document text
    • http://files.shorewoodculinaryarts.org/uploads/1/3/1/4/131406149/mobazibezevo.pdfIn PDF document text
    • http://jiwisig.jeanpenny.com/uploads/1/3/1/1/131164250/e7c8ac017af7c.pdfIn PDF document text
    • http://files.sanctuaries.org/uploads/1/3/1/8/131856443/jebegesogitesol.pdfIn PDF document text
    • http://files.fiddleheadfoods.com/uploads/1/3/1/4/131437017/jinuwolejegi.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/1/0430/6151/0293/files/tofezoko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4517/3910/files/bifeledosizisukegaxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4293/0842/files/bejujozutaxuzofef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/40557527745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/22220929924.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/8511474090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3331/3958/files/amiodarona_iv_bula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8412/8151/files/sojelim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/stay_tuned_for_more_information.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/tepadaloz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1111/3123/files/vovafebulikipimikarafex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1336/6182/files/tisebape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1024/5279/files/pressure_washer_costco.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7964/6878/files/andersen_bajke.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56C3 5184 bytes
SHA-256: 99784be520eae7232b45a10721851f588dd68a455dbec3929b31dbbbad7875ef
font_01_sfnt_off0000686b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x686B 8916 bytes
SHA-256: 5fe23d05a781e79c6bd7bee39037bc28f5487b4571fdcbf805b1cd3ef7a00dee