Malicious PDF — malware analysis report

Static analysis result for SHA-256 416fa0354d973d63…

MALICIOUS

PDF

44.6 KB Created: 2020-09-17 01:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd82b76424a2e1ebd376fa2c930a93e9 SHA-1: db85629d5ad36e20a654539a7e06e6c89ef07c0f SHA-256: 416fa0354d973d639874d054c534656291fb4db218f13b42a431ae4b6facc9f3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF document was flagged by a machine learning classifier and contains numerous embedded links. Two critical heuristics indicate that the PDF links to known malicious redirector infrastructure and functions as part of a link farm. The document body contains the same URLs found in the heuristics, suggesting a deliberate attempt to distribute malicious links.

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.club/wix?keyword=experimental+vs+correlational+examples
    • http://xiwodi.senjistudios.net/uploads/1/3/1/4/131482916/kalozinuriweg.pdf
    • http://files.rayvenholmes.com/uploads/1/3/0/8/130874276/ragadewesaxu.pdf
    • http://files.kedmusic.ca/uploads/1/3/0/7/130738681/3847157.pdf
    • https://cdn.shopify.com/s/files/1/0428/8829/8659/files/96790217439.pdf
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/98930639470.pdf
    • https://cdn.shopify.com/s/files/1/0435/5401/3336/files/94593810961.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/76314380501.pdf
    • https://3ddf059e-e2ea-46c3-9e5b-c3185bc9393d.filesusr.com/ugd/4d400c_e5a7f91da3f84bea9b1675366b0d1c02.pdf?index=true
    • https://52287cc3-ccb6-4c2e-b2ea-993e4a5e6ae1.filesusr.com/ugd/cdfdba_d3d38858241b4341a8394a1e20bb6c0e.pdf?index=true
    • https://77fefc55-2be1-49c7-bcdb-66c27759c6c0.filesusr.com/ugd/4cf28d_7a4e899f0b814f778bc3f09c6678dabf.pdf?index=true
    • https://f6616759-ea9e-4575-9c64-48ad1cdd3974.filesusr.com/ugd/2d1648_d3f7cb51af2d404fae9abd2d59b8007a.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/0584/5397/files/603439057.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4198/files/97134809132.pdf
    • https://cdn.shopify.com/s/files/1/0440/1197/8902/files/ramaxoxuwemulujolebipuxeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/jabapazafubadi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1304/5398/files/connecting_networks_companion_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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007063.bin
56dd436b6f3682f26c9961e7006dc4a0e06e81784a8b510c19b71ecd2b351e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7063 5164 bytes
font_01_sfnt_off000081df.bin
44d67de7387b2897560e6dbcbae1e04aa529b2867472936525e0bdd38c363f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DF 10360 bytes

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