Malicious PDF — malware analysis report

Static analysis result for SHA-256 40641f533b5bdf88…

MALICIOUS

PDF

44.1 KB Created: 2020-08-07 00:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 13af11f876d48d396d7c09dae139229f SHA-1: 9482eef7a65c4ba401673f17f8307c0fa2445c65 SHA-256: 40641f533b5bdf888ec6905111b4cac1bd8dcf636eb7419cffc57dd5c53b766a
194 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains text related to an admission form, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=admission+form+format+for+coaching+institute+pdf In PDF document text
    • http://files.aosfb.com/uploads/1/3/2/6/132682883/kaxilejogizirat.pdfIn PDF document text
    • http://files.2018vote.us/uploads/1/3/2/6/132683251/sokatox_puzubigud_kuzolo.pdfIn PDF document text
    • http://files.ceramics.se/uploads/1/3/1/3/131381109/bejirupukok-fifitowipuxor-legir.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/1/0429/5560/4134/files/98853060593.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6086/2874/files/refadilepeduvogomipoja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/96976764093.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1249/7313/files/20690878563.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/48670214022.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/36050013074.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3873/5517/files/bbg_vegetarian.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/10815069335.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9500/7137/files/97348827186.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/53327610038.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_off0000612e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x612E 5408 bytes
SHA-256: f84cabb159dab67433dba36c041a3c737211a062cd3f8999dfde6c707a1b6799
font_01_sfnt_off0000735e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x735E 10168 bytes
SHA-256: e54514d9f95fdfbf3c3f0057055e3d8683951acb8308b2d72f5eb8d58992384f
font_02_sfnt_off00009592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9592 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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