Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc6b7152bd933d8…

MALICIOUS

PDF

56.9 KB Created: 2020-08-07 22:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee8845432d90809289aa7e326b7f0933 SHA-1: a1d4c17759bd8b6d49529d4bb31e1b4b858d86be SHA-256: 7dc6b7152bd933d81321780024e0346a2e82610cc0309931e4c937d25fb14853
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector service, which is a common tactic for phishing and malware distribution. The ML classifier strongly indicates maliciousness. The document body text, though partially corrupted, includes a URL that appears to be the primary lure, suggesting a phishing attempt disguised as a business communication PDF.

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=body+language+in+business+communication+pdf
    • http://files.valentinamendicino.com/uploads/1/3/0/8/130814342/ac35f7913.pdf
    • http://files.letstakepix.com/uploads/1/3/2/6/132681452/lebegewotixenev_ponugekunotiwa.pdf
    • http://files.lynnnicholaswrites.com/uploads/1/3/2/6/132695445/3551317.pdf
    • http://files.susanmceramics.com/uploads/1/3/2/7/132740338/pitareluk-silomo-sobozub-nijakukepumume.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8633/2575/files/22247067952.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62894204366.pdf
    • https://cdn.shopify.com/s/files/1/0432/8757/6740/files/46904119941.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/prentice_hall_federal_taxation_2016.pdf
    • https://cdn.shopify.com/s/files/1/0437/6631/7205/files/kidodu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5767/5431/files/atharva_veda_sanskrit.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/rerasozojuwebasazaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/applied_physics_by_ak_jha_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5026/files/35153213285.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/nexerukafeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/gefewemor.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/netbeans_8._2_user_guide.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_off00009e17.bin
89133933d7e578f5949d471b9191a1d01136386ec40262692bf5978e3c1d140e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E17 5668 bytes
font_01_sfnt_off0000b15f.bin
c6d43a77098e3b95385d73cad5995b2d7cfe87944b381c7270824e1104d01879		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB15F 10780 bytes

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