Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa6c62daac1324e…

MALICIOUS

PDF

37.2 KB Created: 2020-08-01 11:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0303afea9b48f8a61ae57fb2ea8b7c03 SHA-1: 55b36df8f7dd4fb3b3748e06dc0e5735107907fe SHA-256: efa6c62daac1324ecedb1e25bb6b227a92327a3fd351a84893d5881c4151c6e8
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily corrupted, contains text that appears to be a lure for a 'whirlpool dryers manual'. The PDF also contains a large number of external links, many hosted on Shopify, which is flagged as a link farm. The primary malicious IOC is the redirector URL.

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=whirlpool+dryers+manual
    • http://files.jmichaelmiller.org/uploads/1/3/0/7/130739719/50db7.pdf
    • http://files.luismojica.com/uploads/1/3/1/6/131606803/difowamabitukibe.pdf
    • http://files.wargametransfers.com/uploads/1/3/0/7/130740591/cd0d36d.pdf
    • https://cdn.shopify.com/s/files/1/0431/8055/6452/files/77716161908.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/zevukenabexafej.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/80709112462.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/kijifomel.pdf
    • https://cdn.shopify.com/s/files/1/0437/1067/7141/files/walmart_community_grant_application.pdf
    • https://cdn.shopify.com/s/files/1/0433/5602/9093/files/jobasaxujamosowanekoka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.pdf
    • https://cdn.shopify.com/s/files/1/0431/0102/8503/files/47992435942.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2769/files/89039357936.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7795/files/php_str_replace.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/63114841461.pdf
    • https://cdn.shopify.com/s/files/1/0436/2023/7475/files/48486043671.pdf
    • https://cdn.shopify.com/s/files/1/0438/4882/7040/files/diminawoduvupejekimuzo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/3121424655.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67257536452.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_off00004f8b.bin
aa84a77226f9252447cc44248ec905aacc3fce94dc6b7d03a51c6d08212ad409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F8B 5312 bytes
font_01_sfnt_off0000617c.bin
fb8a5178ac0de9473e9c3d1ac219bca48f23b5334f6c607cb715685ee4c3bb30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x617C 12028 bytes

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