Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e54f4c083ca199…

MALICIOUS

PDF

57.6 KB Created: 2020-10-29 09:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 801f3c834b8d3fbda95281c2aef479b2 SHA-1: d6d6da3d5aea89bd2146d34e9c72e0a36c695245 SHA-256: f6e54f4c083ca1992df4b14cd4277095f671e459188c77554968a61c1c860e99
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDFs, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://cctraff.ru/strik?keyword=house+history+deaths+free', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/strik?keyword=house+history+deaths+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_5f8a9fb5c2df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f893b0acfb7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_5f9173a72a485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f9475715911f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f8732f5b5161.pdfIn PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/giguviladomimis-sazisoles-xadarok-zezorevaxoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f873c3827941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_5f9989f1702b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_5f893b2d0d5ea.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/posumiwuwolosurun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/davawina/45968713429.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6629/0076/files/nazez.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/39358449006.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/bucor_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/zenet.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/39866930490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/dazaxokerilodogisexar.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/malonic_ester_synthesis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA41A 5024 bytes
SHA-256: 5f7bf45876f424047b11b2dbfd3b832d72e79b87afadb032c2aab2d8c85fb925
font_01_sfnt_off0000b530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB530 10576 bytes
SHA-256: 543a33bc5d9dd1594ba1611c3eaf12d1b95e4884aba3b8b99eb3b3f579efda9d

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