Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13034b0125aa7c7…

MALICIOUS

PDF

49.3 KB Created: 2020-08-02 12:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa16d2f30849811ac134cfae63c5c9dc SHA-1: 51e21fd5e2bde5e39016627e53ddaeda069c1dac SHA-256: a13034b0125aa7c70d53c53d2bafc1c81f250d076a2797367bdfcaca5efe5a94
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious and contains a significant number of embedded links. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.ru/pify?keyword=dotties+weight+loss+zone'. Another critical heuristic indicates a PDF link farm, with many links pointing to external PDF files hosted on domains like cdn.shopify.com. The document body contains garbled text but also includes the suspicious URL and several Shopify-hosted PDF links, suggesting a lure or redirection mechanism.

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/pify?keyword=dotties+weight+loss+zone
    • http://files.maxhumphries.com/uploads/1/3/2/6/132681690/cd53b4da6dfcf65.pdf
    • http://files.ihomeprestigeluxury.ca/uploads/1/3/0/7/130739155/wagid.pdf
    • http://files.younionstudio.com/uploads/1/3/0/9/130969169/filovoposaxet_tevumod.pdf
    • http://files.alliedcontractorsgroup.com/uploads/1/3/1/4/131406800/67a6171857e.pdf
    • http://files.streamteamsunited.org/uploads/1/3/0/8/130874526/09ebabe00fee9.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/jafoxopobusefuxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8233/4883/files/84004870009.pdf
    • https://cdn.shopify.com/s/files/1/0429/9541/7237/files/28331263593.pdf
    • https://cdn.shopify.com/s/files/1/0437/1172/5723/files/gijuwiwapilerejesomidadov.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7428/files/42250590459.pdf
    • https://cdn.shopify.com/s/files/1/0428/5507/1900/files/60316970769.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/ravujubabasuxez.pdf
    • https://cdn.shopify.com/s/files/1/0434/8959/1461/files/polamavape.pdf
    • https://cdn.shopify.com/s/files/1/0433/7297/0133/files/wubikevofi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/5352/1823/files/90543208949.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007538.bin
708360c0a54acf8a5d2fe32e730b7734ca1981d962d699fcba167bb21c355391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7538 4784 bytes
font_01_sfnt_off000085a0.bin
2371cefda4db6b1c55c2955231d2aa09e340e97d52c5f19b9689e79c2de58c04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A0 16188 bytes

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