Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ea15865a886f24…

MALICIOUS

PDF

36.3 KB Created: 2020-08-13 11:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 457054ffe86e3e4533742bb625e2f6c6 SHA-1: 46bd02fb613527bb35309aea4775f1f143954b94 SHA-256: 85ea15865a886f24dc7b9224651e74b9138ee1252f9bfa79e51598e0b96a9a4e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or SEO link farms. The primary malicious URL identified is https://ttraff.ru/wb?keyword=derecho%20constitucional%20mexicano%20burgoa%20orihuela%20ignacio%20pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a tactic to drive traffic to external sites.

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.ru/wb?keyword=derecho%20constitucional%20mexicano%20burgoa%20orihuela%20ignacio%20pdf
    • http://files.lyonskinder.com/uploads/1/3/1/6/131606396/lakevave-siruxaxora.pdf
    • http://files.jerrywilliamsphotography.com/uploads/1/3/2/6/132682851/runiko.pdf
    • http://files.gaelicfootballsa.com/uploads/1/3/1/3/131379231/femupa_tofale_domikavolaget.pdf
    • http://files.gammazetadecaturtn.com/uploads/1/3/2/3/132303219/4033c57.pdf
    • http://files.nomadicwellness.com/uploads/1/3/2/7/132740172/daliputarinexet-perulus-pejisa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3708/8154/files/giant_robot_buckethead.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/rakokisixogavoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/17426671030.pdf
    • https://cdn.shopify.com/s/files/1/0435/9172/9309/files/ancient_history_class_6_old_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3654/files/97418959459.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6008/files/arranged_rk_lilley.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/29226383123.pdf
    • https://cdn.shopify.com/s/files/1/0435/5702/8001/files/lunefutaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/4995/0116/files/vakivunadubiraguno.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/82456774797.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/60671537795.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/various_forms_of_energy.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_off00004f30.bin
e4835a0a6818bcdf6cb534861c7b4e4c0a5edd28845dcc0084a7e5197bc7817d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F30 5776 bytes
font_01_sfnt_off000062ab.bin
11d1d1641c6cfd841808de433fa3d292a5cc574bb69897d6ce902ab7f102c8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AB 9680 bytes

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