Malicious PDF — malware analysis report

Static analysis result for SHA-256 0731b09242322c46…

MALICIOUS

PDF

43.9 KB Created: 2020-07-30 08:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b2a12eb7c0bb182d75a52b3dbf70f6e SHA-1: e43c65ada6db4119505bb1b3d80f5986b42ebaa1 SHA-256: 0731b09242322c46ea255d95e64373364c9ab0d8187d941344bb47a2f998f49a
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'French accordion music PDF'. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs suggests an attempt to distribute further malicious content or phish users.

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://ttraff.cc/wb?keyword=french%20accordion%20music%20pdf
    • http://files.rebec2000.com/uploads/1/3/1/4/131409128/tekerujelovuz-tewukulusid-xinelewidabe-zatogebozosiwe.pdf
    • http://files.cchoneybrook.org/uploads/1/3/0/8/130813770/zaredamivami.pdf
    • http://files.cissoise.com/uploads/1/3/1/4/131408103/4021701.pdf
    • http://files.aasca.org/uploads/1/3/2/6/132680986/b46292a632.pdf
    • http://files.two-suitcases.com/uploads/1/3/1/4/131407944/gutoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1937/0659/files/85891655042.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/fivixufukibupujodub.pdf
    • https://cdn.shopify.com/s/files/1/0435/1728/0408/files/19941920916.pdf
    • https://cdn.shopify.com/s/files/1/0431/9857/8848/files/80387786209.pdf
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/bugifemurukuferutolize.pdf
    • https://cdn.shopify.com/s/files/1/0440/8321/6549/files/jegujubigakuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1660/files/83809788288.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/88291305469.pdf
    • https://cdn.shopify.com/s/files/1/0428/5674/3079/files/70766023436.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/33682211813.pdf
    • https://cdn.shopify.com/s/files/1/0430/2523/6121/files/sawusurokero.pdf
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/68535078282.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/dogomelakexuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/79533392799.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e42.bin
b72d6553bd9411b0e93b0944b3064da04cb184d7153ad8e20cec61580f98e980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E42 5120 bytes
font_01_sfnt_off00007f6a.bin
72ec2e97fdfae518a7129acbd206787742994d4327bd538ccdc5f65c73502a42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6A 10180 bytes

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