Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e773c849c8fd722…

MALICIOUS

PDF

40.7 KB Created: 2020-08-17 17:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df8036942fad91fc265ff29fe497494d SHA-1: bccd24e3cb6c75379bc8010bf733c4d7f1cb5de0 SHA-256: 0e773c849c8fd722f3dead0cc34b4771a6f8d6a88ade043b49288261c6655ede
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.com/pify?keyword=food+quantifiers+worksheet+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links, indicating an attempt to direct users to malicious infrastructure under the guise of educational content.

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=food+quantifiers+worksheet+pdf
    • http://files.george.work/uploads/1/3/1/8/131871621/5840953.pdf
    • http://weraga.dojgameshq.com/uploads/1/3/1/8/131856602/soziwozo_kumavuwolavekib.pdf
    • http://files.bpoelks411.org/uploads/1/3/1/6/131636772/5992647.pdf
    • http://files.ascientistengineer.me/uploads/1/3/1/8/131871650/kuwativet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1121/1417/files/lomami.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/island_biogeography_ecology_evolution_and_conservation.pdf
    • https://cdn.shopify.com/s/files/1/0428/1935/4791/files/analisi_logica_esercizi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9744/7836/files/developing_problem_solving_skills.pdf
    • https://cdn.shopify.com/s/files/1/0440/0683/4334/files/61098538362.pdf
    • https://cdn.shopify.com/s/files/1/0436/1371/6643/files/tivoxowoduwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1628/9447/files/7954863850.pdf
    • https://cdn.shopify.com/s/files/1/0429/6058/4870/files/30071701859.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1192/files/padefolipavifalakifilokas.pdf
    • https://cdn.shopify.com/s/files/1/0433/9177/8965/files/8349675466.pdf
    • https://cdn.shopify.com/s/files/1/0433/8089/9991/files/somukelubufuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/zajidufesuxilesum.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_off00006159.bin
58c23a16f160dc12514a64d3d4ed41a8785408865bf5ef6c807003c52809f0bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6159 5336 bytes
font_01_sfnt_off00007394.bin
67010dbde75815308ebb40e2e1a0a52c7e3daf25623dfb0fa994d36829647c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7394 10132 bytes

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