Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa9c099a4c426fd…

MALICIOUS

PDF

38.9 KB Created: 2020-08-04 23:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65032fef36dab140e9b1511940974f86 SHA-1: 28dc8612d68eb9898e3f160a431822971c5de5e0 SHA-256: 5aa9c099a4c426fdb3314c73cfcbb11d751d2cc5179d1129efc45be51c430fce
174 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm, suggesting an attempt to drive traffic to malicious sites. The ML classifier also flagged this PDF as malicious, supporting the conclusion of a phishing or malware distribution attempt.

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.ru/pify?keyword=builders+profile+pdf
    • http://files.twocann.co.uk/uploads/1/3/1/0/131070367/229c43d25.pdf
    • http://files.authenticbathroomrenovators.com/uploads/1/3/1/4/131410158/xoxewixifoweto.pdf
    • http://files.carolowenheartfelt.com/uploads/1/3/1/3/131383743/4061495.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/fovuzuxuwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/6339/2921/files/zawun.pdf
    • https://cdn.shopify.com/s/files/1/0440/5172/6501/files/86619113217.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/watch_battlestar_galactica.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/44251251777.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/nomozebovawawuzasilorafij.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5757/files/30665050961.pdf
    • https://cdn.shopify.com/s/files/1/0437/4944/1687/files/wugomorizurumulaxetar.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3568/files/liquido_amniotico_fisiologia.pdf
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/lamidosuzezazakinujis.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/jeturirisubatavedexakez.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_off00005ae7.bin
5ab5d37dcb9f8786216472a820da9a6f2ffc87ec489d96d1462a58b7f7b6d8d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE7 4876 bytes
font_01_sfnt_off00006b8c.bin
c2368efb6619f462ee2bf2f97ee367ad44051ca7b56ecb1ccd4b41de81e70966		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8C 10516 bytes

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