Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91a1bbbf2748f2f…

MALICIOUS

PDF

52.6 KB Created: 2020-08-09 19:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f756e9e3859a0f0e7c2f3a52a4b84e0b SHA-1: a50ebbcb9d1f46f2132f1772ece5c66904764da4 SHA-256: b91a1bbbf2748f2f9f9415a5f755bcacb62cf1bda8477852398103e6577fb71e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or redirection strategy. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=anticoagulant+used+in+blood+bags+pdf'. The document body also contains this URL and other PDF links, reinforcing the attack pattern of luring users to malicious content. No scripts were extracted from this sample.

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.cc/pify?keyword=anticoagulant+used+in+blood+bags+pdf
    • http://files.greaterheightsfellowship.org/uploads/1/3/2/6/132682585/vogufude.pdf
    • http://velevi.valleyharvestmarathon.ca/uploads/1/3/1/4/131408027/mipiviwiwifunakagi.pdf
    • http://files.greatwhiteninja.com/uploads/1/3/1/3/131381450/1783537.pdf
    • http://files.doubleeagleadvisers.com/uploads/1/3/2/6/132683328/fetixewomepojis.pdf
    • http://files.lierchonpoo.com/uploads/1/3/1/1/131164312/suduxunasini-xutawajefi-bedudimugokikof.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9562/files/66618074164.pdf
    • https://cdn.shopify.com/s/files/1/0434/9476/8802/files/78805888577.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5811/files/vezoluzamemiza.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/41875679648.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/bafarisexitisemowufib.pdf
    • https://cdn.shopify.com/s/files/1/0432/2243/3953/files/fisavevivu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/7689817550.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/581871399.pdf
    • https://cdn.shopify.com/s/files/1/0433/9800/4899/files/relieving_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0440/6129/4757/files/bead_making_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/famafip.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3851/files/balupegovajeg.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b5.bin
99de0075babe09bbd2e554d618c21792f8dc5c1bbea71f83dd57a532bf3188a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B5 5240 bytes
font_01_sfnt_off0000768d.bin
3b8f8c98e11e33f51ac3309780964f20062aeef3c5b22457056b2bafa0672330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768D 10936 bytes
font_02_sfnt_off00009b3f.bin
094e883b4da6bc6eba9534a227088ae5dd55a145b8a6a57948024a21bc36aada		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3F 17900 bytes
font_03_sfnt_off0000b65f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB65F 4324 bytes

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