Malicious PDF — malware analysis report

Static analysis result for SHA-256 31081b333ffe164b…

MALICIOUS

PDF

34.9 KB Created: 2020-08-15 05:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a75cc0698ac4b62ea110a630b52e2b50 SHA-1: 3787680de698f4f84bb34d1816a01ef7374ebfd1 SHA-256: 31081b333ffe164bf897074acb7551080239183816e1f68daed2b85ade598e4f
150 Risk Score

Malware Insights

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

The PDF contains a link to a redirector hosted on 'ttraff.com' which is flagged as malicious. The document body and heuristics indicate a lure related to 'hazardous materials operations test answers', likely intended to trick users into clicking the malicious link. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=hazardous+materials+operations+test+answers
    • http://files.entomoanthro.org/uploads/1/3/1/4/131483197/nizijeb_toririwinere_lunemepax.pdf
    • http://files.cyclingadventures.net/uploads/1/3/2/6/132695689/sulexovabub_bubizelogu_mekodovi_pinuvawenun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nezax.pdf
    • https://cdn.shopify.com/s/files/1/0434/3309/9430/files/wekemijetunos.pdf
    • https://cdn.shopify.com/s/files/1/0429/0081/6028/files/free_dj_sound_effects.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/5063157119.pdf
    • https://cdn.shopify.com/s/files/1/0436/8472/4889/files/rezujadajaxoduw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94766401197.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/a_k_jain_practical_physiology.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/fudamijisodifizi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1152/9114/files/79270672580.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1780/files/waminobanixufelozabezerub.pdf
    • https://cdn.shopify.com/s/files/1/0428/8321/9619/files/4791507563.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b80.bin
791d6f3ba55a4156b41e0de4bc14c96a7511a401fa7343793b58684223a14e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B80 5208 bytes
font_01_sfnt_off00005d30.bin
a286fb90ad31c9b687b23e66c36f79b33755fd087d4a8984f5634dd0068083bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D30 9820 bytes

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