Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8870cb95d78bc5e…

MALICIOUS

PDF

40.9 KB Created: 2020-11-05 16:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 68c70faa1511c96da63a0f3a3c878156 SHA-1: 2771f5f64a6e014d95b848c0ac8d544eb7c331ea SHA-256: a8870cb95d78bc5e124e6dc480c24ad4233375718bdd0bbc67e948b0e2057212
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://cctraff.ru/aws?keyword=google+hangouts+meet+app+download+for+pc, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain similar URLs, suggesting a lure for users to download software. The presence of a link farm heuristic further indicates an attempt to distribute content, likely malicious, through numerous linked PDFs.

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/aws?keyword=google+hangouts+meet+app+download+for+pc In PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/f537dd39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5fa1f8245e411.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/sakup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f933d9de8537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f9c0a978fc3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/834f172c-9974-4d90-a4d4-c7040bca9b2b/disumuganuvaxunadifomukew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acfd3209-66eb-4153-b983-4648428bd489/canon_eos_rebel_t6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a75c0da6-ae9c-4ae2-a9a1-5f50a382b91d/munajubog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa781f54-3e73-4aa2-88ac-466c639c260d/9943895842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d85361a-d069-4774-b11b-47358e253eb2/31142019492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d49704-01f4-43b6-8352-06ae9492b5ec/21465414346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff1ba42-cc95-41ae-83db-6063026d8c74/zaxavunenipijowulig.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6223 5692 bytes
SHA-256: 2844ebc1f7ea3c565a4a11de745ff0b6cee27576099fc8ff4beaef0218164877
font_01_sfnt_off0000756d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x756D 9732 bytes
SHA-256: 44ed9be8df97a7dd1bd053ff900fdca42ae82104b7db85168ab235c218e0aa75

Open this report in the interactive analyzer, or submit your own file for analysis.