Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5544ee1e4c04dd…

MALICIOUS

PDF

36.0 KB Created: 2020-08-24 01:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87e1d17a676c40d3906cea21cfca3782 SHA-1: b3c0ef2d25f5298d9f6012e96ee3b73fc630df0f SHA-256: 7a5544ee1e4c04dd0f95d155e0c08479b0adeed77530d605e0e3b7e977d018ca
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'https://ttraff.ru/pify?keyword=cost+accounting+past+questions+and+answers+pdf'. The document body, though heavily obfuscated, contains text related to 'cost accounting past questions and answers pdf', suggesting a lure. The presence of many external PDF links, some benign and some unknown, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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=cost+accounting+past+questions+and+answers+pdf
    • http://mikodugij.trainingspaceokemos.com/uploads/1/3/1/3/131380181/a8ca9.pdf
    • http://files.coachedscience.com/uploads/1/3/0/8/130874254/464750.pdf
    • http://files.miortuk-alaskan-husky-kennel.com/uploads/1/3/2/6/132682829/xidowipew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/46930052020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40133843423.pdf
    • https://cdn.shopify.com/s/files/1/0430/5325/2757/files/59584038129.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/76440639136.pdf
    • https://cdn.shopify.com/s/files/1/0440/3717/7494/files/articulacion_atlantooccipital.pdf
    • https://cdn.shopify.com/s/files/1/0430/8926/4794/files/diskpart_initialize_disk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9574/3907/files/gagabuduzatubalezuzaweda.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/12698592533.pdf
    • https://cdn.shopify.com/s/files/1/0436/0133/0339/files/que_es_el_catecismo_de_la_iglesia_catolica.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1207/files/94225292570.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3042/files/mutupisaxegabavipumajaxum.pdf
    • https://cdn.shopify.com/s/files/1/0463/5338/3586/files/request_for_customs_clearance_information_dhl.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_off000048c6.bin
a8ca6a880c6968f261c4f9ba7bf732f8fb51b55f59f985368ba855741faea7cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48C6 5412 bytes
font_01_sfnt_off00005b4b.bin
aa1fa53eff71e35f4fad9076119d8a36570427c7bddc8d0336260983d126d5cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4B 12836 bytes

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