Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb338968ec1fffe5…

MALICIOUS

PDF

69.3 KB Created: 2020-11-04 11:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cefecb0f19cae5e070ad9baa380c4ab0 SHA-1: 1c5a75dd6bbb72cd2fa7cb47eb8d4eecc3c2de2b SHA-256: fb338968ec1fffe52c35ffa1b39f4cc74ce14374905dad095d9d4facc815c664
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link. The document body, though partially corrupted, contains a URL that matches the redirector heuristic, suggesting an attempt to direct users to malicious infrastructure. The presence of a large number of external links, identified as a PDF link farm, further supports the malicious intent.

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://cctraff.ru/strik?keyword=chippewa+falls+middle+school+website
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/nefuzuwalawivalev.pdf
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f8af20294852.pdf
    • https://wisizexabebaj.weebly.com/uploads/1/3/4/4/134461468/xibikesuwevajusonaki.pdf
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f9e124387a9c.pdf
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5f91f0871c5d2.pdf
    • https://purigimotefejis.weebly.com/uploads/1/3/4/3/134308192/35ca50813.pdf
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/nedav-fukew-jerifolad.pdf
    • https://badasemo.weebly.com/uploads/1/3/4/4/134482086/rekovurimobadi-garerikixus-pirodude.pdf
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/kofukuxiwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a4d1180e-2804-4461-9908-f72bd3ae5db1/luzupuwokezopijasuwi.pdf
    • https://uploads.strikinglycdn.com/files/e861af79-e4a7-4449-bffa-ec9cedf3722b/lash_excel_reviews.pdf
    • https://uploads.strikinglycdn.com/files/3db1d2ca-e307-4adc-a34a-448f155d3830/bamotumujedopemopewe.pdf
    • https://uploads.strikinglycdn.com/files/711a7940-5a24-4a9a-82b3-afa0c0263fc7/milagifewedavu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c221.bin
296c74dba2f154276de79dd0ae5fbaa3956b31c2cb1d6ff346bd76b8c10696eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC221 5236 bytes
font_01_sfnt_off0000d40b.bin
ceadc3a46a490ea87855ef7855ac7580b1908099c955357d598b9b2cf0a2eac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 11024 bytes
font_02_sfnt_off0000f991.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 4324 bytes

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