Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8c10b6b56566e0…

MALICIOUS

PDF

43.4 KB Created: 2020-08-19 01:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42601271f1ebf9217954cdfa71c0c857 SHA-1: 63c183e7b0ca4f1cc7f051e08ee7447401d34c74 SHA-256: 6b8c10b6b56566e0d3f1af47f10a349d8bc2b113aa4df0ede48ccad7f2846946
174 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for accounting answers, and the heuristic 'SE_CALLBACK_LURE' indicates a phishing or tech-support scam pattern. The presence of embedded URLs and the ML classifier's high confidence further support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/pify?keyword=knowledge+matters+management+accounting+answers
    • http://files.1800cuttree.net/uploads/1/3/0/9/130969357/lakomeralefev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1565/9942/files/process_safety_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0430/3260/8921/files/nazibavas.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/62425679879.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/40375177305.pdf
    • https://cdn.shopify.com/s/files/1/0431/1672/4386/files/wulut.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/15072397137.pdf
    • https://cdn.shopify.com/s/files/1/0435/6050/1407/files/20829439675.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/63602015581.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7177/files/project_on_adulteration_of_food_for_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0438/0524/5597/files/32436422341.pdf
    • https://cdn.shopify.com/s/files/1/0439/0499/1387/files/veposatujizife.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/tidegagowuruximikesutumu.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_off00006a72.bin
4b03af219ec662c5a6c886d08031c37692d96768cd688df2aa96c7f864510f38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A72 5320 bytes
font_01_sfnt_off00007c80.bin
5c4e4aa7f600c01e06c1de2159ccc38e9b7a36a98d8f126159eeec25895958c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C80 10644 bytes

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