Malicious PDF — malware analysis report

Static analysis result for SHA-256 6177873fc37960d3…

MALICIOUS

PDF

45.5 KB Created: 2020-07-29 11:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37faaae41995736a589d48f416757adb SHA-1: 0cd25e249aa8137161ad7ce332e0845bd2af7048 SHA-256: 6177873fc37960d3d2e4f3b813e9b43096152e99066364cff111c8cb4767b960
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) known for malicious activity. The document body, though heavily obfuscated, suggests a lure related to 'transversus abdominis exercises pdf'. The presence of numerous external PDF links, including those hosted on Shopify, indicates an attempt to create a link farm or distribute malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

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.com/pify?keyword=transversus+abdominis+exercises+pdf
    • http://files.jolonbathbody.com/uploads/1/3/1/0/131070849/f0398d9.pdf
    • http://files.millennialepoch.com/uploads/1/3/1/4/131453256/1394168.pdf
    • http://files.inclassicfashion.se/uploads/1/3/2/8/132815968/mizifame.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/52564449618.pdf
    • https://cdn.shopify.com/s/files/1/0434/0698/3333/files/sibazefonofun.pdf
    • https://cdn.shopify.com/s/files/1/0434/9778/3458/files/5115383769.pdf
    • https://cdn.shopify.com/s/files/1/0435/9903/6573/files/26777059096.pdf
    • https://cdn.shopify.com/s/files/1/0428/1306/3335/files/fijutin.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/genunakov.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/98663164449.pdf
    • https://cdn.shopify.com/s/files/1/0439/4713/1035/files/1767918275.pdf
    • https://cdn.shopify.com/s/files/1/0436/2862/6080/files/23719488811.pdf
    • https://cdn.shopify.com/s/files/1/0434/7455/0950/files/43332609220.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/xajaxitutexeduv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0298/6659/files/72139830323.pdf
    • https://cdn.shopify.com/s/files/1/0440/8567/4149/files/97871304829.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_off00007476.bin
9d7b9c8a3b62fcafa77e85d251da4f6dc672fc268d2df1fb13002e04434e795c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7476 5288 bytes
font_01_sfnt_off0000864e.bin
9e389eb5e022e039ec36ea2bb81576c75c2e810f25492b3960742f73e5f3f3b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864E 10028 bytes

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