Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0da4de05300f725…

MALICIOUS

PDF

61.5 KB Created: 2020-12-28 03:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d8a9a9bb303bff536aebd67c198819e8 SHA-1: d0edbb8a086670a1dc27408d4167f2867144f09e SHA-256: f0da4de05300f72577efb3a4a6ffe6c1b6b22cb054e7b6fcdeb3c2e93e965687
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous links to external PDF files, many of which point to redirector infrastructure like 'gettraff.ru'. The document body, though heavily obfuscated, suggests a lure related to 'solutions worksheet answers'. The embedded URLs are likely used to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=solutions+worksheet+answers In PDF document text
    • https://cdn.sqhk.co/xisiwuba/hgpNLes/22687319717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_5fd8870095fcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_5fc40ddc0afad.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/RT7ihUi/the_legacy_of_the_bones_trilogy_book_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_5fd3caecf32bd.pdfIn PDF document text
    • https://mawovajexajadow.weebly.com/uploads/1/3/0/8/130874262/6788844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_5fc3572bb90fe.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/c1d35610-5840-4a9d-8d37-fd79ffd27242/31390586842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3dd8629-9278-4871-990d-395c78ff9a20/castle_of_illusion_ps_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25a2bf0b-879e-4606-b381-095dbcc9ec07/2020_aarp_medicare_advantage_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb5c04b-6560-4881-908b-f9b2b5430ac4/aveeno_positively_radiant_cc_cream_broad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a186f4-dde5-47f2-ac42-dc231d7a0bf4/konokikuv.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_off0000b766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB766 5032 bytes
SHA-256: 584f086928b0a9b61584bed3c2e3e1e1bfb72623846efb04db83354dab76f20c
font_01_sfnt_off0000c888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC888 9656 bytes
SHA-256: 24be6ad31191768e3f6cce694eb6ccac1428eb7ea1a95a633eac546dc6a5e4c8

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