Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9ac9d8b11d6297…

MALICIOUS

PDF

46.3 KB Created: 2020-08-10 13:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67e7d81581b1f2b9e186556648dbd600 SHA-1: 7d63cbc757c68cec0b17cc69b8a66cf52708f376 SHA-256: 0f9ac9d8b11d62979a1448562b2553b748fa69f6d73cdea9730c2e659c625c61
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm designed to host other PDFs. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF titles, suggesting a lure to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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=motivational+speech+for+students+in+gujarati+pdf
    • http://files.progressivehealth.org/uploads/1/3/0/7/130740123/buduz-sopakokivemife-rodobobosezazot.pdf
    • http://files.dominiquejo.com/uploads/1/3/1/3/131382141/repaletikiwesa-bizowabufep-kifimefagop.pdf
    • http://memikobo.teddybearpoms.org/uploads/1/3/1/3/131378950/c492e5ec480.pdf
    • http://tuvodega.annablossom.us/uploads/1/3/1/8/131856543/766477.pdf
    • http://files.mfhlp.com/uploads/1/3/2/8/132814949/kuzusorufesebojuvupu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/nawiginotujizaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/english_russian_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/girudibuge.pdf
    • https://cdn.shopify.com/s/files/1/0441/0382/7608/files/ode45_second_order.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/83993065637.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/kozaj.pdf
    • https://cdn.shopify.com/s/files/1/0436/0352/5794/files/crime_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/25873242983.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3045/files/exploring_creation_with_biology_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/bogawotikili.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/fluid_mechanics_8th_edition_frank_white.pdf
    • https://cdn.shopify.com/s/files/1/0433/3859/6510/files/dadatas.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4658/files/56192742583.pdf
    • https://cdn.shopify.com/s/files/1/0436/9278/5818/files/administracin_por_calidad_total_tqm.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7612/files/4633412300.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_off000076b1.bin
58d8c1dd738c949d001d5f9b442fdbb57ed1d5b0e85b506e46b830557761f953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B1 5560 bytes
font_01_sfnt_off000089a6.bin
b6edb82454796da3dcaec4f244ce20a61d983e20ae981212df10df44d098f93b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A6 9928 bytes

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