Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c81b2c8292caf88…

MALICIOUS

PDF

38.3 KB Created: 2020-08-02 03:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 33bef816906e4f4c38f1a51c344369ee SHA-1: 326284e7cee4becdb90a7b78c7275dbd15b1b142 SHA-256: 8c81b2c8292caf88afe54b4ff8382a32a39b2ead357580e50852e33cef01a96c
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.cc/wb?keyword=hochiki%20call%20point%20manual`. The document body, though heavily obfuscated, contains this same URL, indicating the primary intent is to drive traffic to malicious or potentially malicious sites.

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/wb?keyword=hochiki%20call%20point%20manual In PDF document text
    • http://files.creativechoicescoaching.com/uploads/1/3/1/6/131636725/zorageretibed.pdfIn PDF document text
    • http://files.good-byebabe.com/uploads/1/3/0/7/130740483/soxos.pdfIn PDF document text
    • http://files.alexanderecology.com/uploads/1/3/1/4/131438563/lokegikosexiras.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/1/0429/8565/2375/files/9896521608.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6738/3716/files/tesotovomeso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/91404925031.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0102/7493/files/fema_ics_100b_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/rakifunaxipiradafiropofoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/85348439097.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/2238511756.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7311/7087/files/cobit_5_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9503/7854/files/25974922520.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4618/2822/files/dasatepof.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
🗂 Part of campaign: alexanderecology.com 7 samples

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_off00005a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4C 4924 bytes
SHA-256: 56966820ad16044050837e39f7a0ed0a0d8a92e7b098705bafdabde759f6ddcf
font_01_sfnt_off00006ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE8 9864 bytes
SHA-256: b87c0620363e7194f3be91c04c09406b48a938be505e49d6aa090774113f3d61

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