Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a7aa4f1468ba85…

MALICIOUS

PDF

68.6 KB Created: 2020-11-20 16:58:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c180d3ee37be3028f0efce7371f934f SHA-1: 962850e21b89168ecd101d7609566e58df6838aa SHA-256: 92a7aa4f1468ba85b09953e946d8046613122801b966e94c70e7796ec49493e8
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDFs, likely for SEO manipulation or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of external URIs further supports this. While no scripts were directly extracted, the PDF structure itself is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://trafffe.ru/123?utm_term=lovely+bones+book+characters
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/raweme_zategupikebuf_dafunopudewisu.pdf
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5fabb9747626b.pdf
    • https://dojigatat.weebly.com/uploads/1/3/4/5/134586133/b5a7ce63f2cb30.pdf
    • https://nodemexawek.weebly.com/uploads/1/3/4/3/134331915/84aa9.pdf
    • https://cdn-cms.f-static.net/uploads/4460465/normal_5fab228ae200a.pdf
    • https://cdn-cms.f-static.net/uploads/4445337/normal_5fb30cb2d0424.pdf
    • https://powedumino.weebly.com/uploads/1/3/4/3/134350182/af74c7.pdf
    • https://cdn-cms.f-static.net/uploads/4460950/normal_5fae0f535d7f5.pdf
    • https://welofubevi.weebly.com/uploads/1/3/1/8/131856084/d6a450.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2a742479-01dd-4d4f-a1aa-7f978c77c9b5/rukunotosituga.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/ratogodi.pdf
    • https://s3.amazonaws.com/wanalovum/tower_defense_unblocked_at_school.pdf
    • https://uploads.strikinglycdn.com/files/1bf268e1-91ff-41cc-bb80-b4a6522338a4/90755172685.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cffa.bin
63bcbad58bbd91a6052fcec64abc1c6b02c3174a5021ebda0b14a3fa97dc1c03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFA 5196 bytes
font_01_sfnt_off0000e1ad.bin
342d0eaddc2e0f3dc6ee56ca38875b03a3b3ce9c175e9341f3539b5992e0f677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 10656 bytes

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