Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8389e4ae89b47ea…

MALICIOUS

PDF

130.2 KB Created: 2021-01-01 08:10:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c4e4962735533a0977c3084d9371c5d7 SHA-1: 5c715a9eb755c7fdf919e7f1b25e622a958151bf SHA-256: d8389e4ae89b47eab350f0b588c143a61a7fa1699de790773a67a8f79163ea0e
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a significant number of external links, indicative of a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains text related to 'cookie clicker achievements guide', suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links, including one pointing to 'trafficel.ru', strongly suggests the document's primary purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?utm_term=cookie+clicker+achievements+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377095/normal_5fdd957397770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_5fd759454220a.pdfIn PDF document text
    • https://zabonipe.weebly.com/uploads/1/3/4/4/134487368/279580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5fa6fb1eacafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_5fe77f16e9e39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417315/normal_5fa025b51f94f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389127/normal_5fd9b41bcb95d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_5f94270164a8b.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/dd35beb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_5fd82888e6be6.pdfIn PDF document text
    • https://xizimojagetotom.weebly.com/uploads/1/3/3/9/133997363/mebomonaxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_5fb9280ca0001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5f98799cd07f8.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/1eb29797-4909-49a3-95db-be5dc8c92936/liwitijimiketebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329be88c-cd4f-4cda-a0aa-3d31175be54f/nixovi.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_off0001b74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B74C 5384 bytes
SHA-256: fede6525bd84eae7005a6034ea553ebe4e4ce6f5ba94b1adba4bbc7d719cf649
font_01_sfnt_off0001c971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C971 15020 bytes
SHA-256: 30f0d532977b4d8dc7ec18fd31af9ff70a136e90ba444f67d0bf62568427b6bf

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