Malicious PDF — malware analysis report

Static analysis result for SHA-256 636e6e57d40fd858…

MALICIOUS

PDF

47.8 KB Created: 2020-08-06 12:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ef45092178e2899ab74f9f67deab435d SHA-1: 781da2dd8ca9b1f3b137654da880557c24998c90 SHA-256: 636e6e57d40fd85810d952db6d8ece8d1eb6945f29d320d0ded73026775096bd
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to an SEO redirector, which in turn points to a link farm of other PDFs. The primary redirector URL is identified as malicious. This suggests a phishing or scam attempt disguised as a document download. No scripts were extracted, and the document body is heavily obfuscated, but the presence of malicious redirectors and a large number of external links strongly indicates malicious intent.

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.cc/pify?keyword=history+of+lactic+acid+bacteria+pdf In PDF document text
    • http://files.firstmennoniteiowacity.org/uploads/1/3/1/4/131407067/3905704.pdfIn PDF document text
    • http://files.thereservehtx.com/uploads/1/3/1/3/131398250/fepubikofol-sekumitodug-xevupu-futabogow.pdfIn PDF document text
    • http://gegafop.themissingprincess.com/uploads/1/3/2/3/132303189/daa4e26e97df6.pdfIn PDF document text
    • http://pigekum.b2w2.org/uploads/1/3/1/3/131380600/2bc45c7ccc0e8.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/1/0428/9481/9484/files/31914980733.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9493/2640/files/fujokivulitupuja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3880/1061/files/zomixakumejekurax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6510/4791/files/mivavogebivaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8387/3942/files/79656160706.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/50110187105.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/98323871988.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/58855057672.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1188/2653/files/lilenerapebesovejadoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/zunuzurebewidud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/11475955396.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/westgate_travel_club.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1619/9066/files/7884738742.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 2

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_off00007d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2E 5352 bytes
SHA-256: 3edb65e6071304474ebc08a208190daa49e4e48201b37dbe4d5b160d8ac17bfd
font_01_sfnt_off00008f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F71 10160 bytes
SHA-256: f3dbb1d3545908cfaa0eb09ba21c91c73e238dce18a52c7488f883bf06b175f5

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