Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ac39906175585c…

MALICIOUS

PDF

43.0 KB Created: 2020-11-06 21:09:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad87ce45246a4aad645a44890bf60734 SHA-1: 509f1246bf5a88243f8c9ae7ba21a2ed9bfa5462 SHA-256: 38ac39906175585c27b8d8c4287252998b008b3419d23a659650596a9a769576
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure for a 'used tv price guide' which redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs strongly suggest an advance-fee scam, as indicated by the SE_ADVANCE_FEE_SCAM_LURE heuristic. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of malicious links and the scam lure are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/123?keyword=used+tv+price+guide
    • https://cdn-cms.f-static.net/uploads/4447874/normal_5fa519c2897bf.pdf
    • https://zijisejimalunu.weebly.com/uploads/1/3/4/4/134495917/gaxojun_sadaxugav_lisotugope.pdf
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5fa086eae640b.pdf
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/1126496.pdf
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/8450284.pdf
    • https://cdn-cms.f-static.net/uploads/4418981/normal_5fa269f40a5f7.pdf
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5f993d1c979a4.pdf
    • https://cdn-cms.f-static.net/uploads/4402520/normal_5f9bbd7cbc86c.pdf
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f9d57f7f3172.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdf
    • https://getalam.files.wordpress.com/2020/11/30041979975.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_off00006a51.bin
78ab81cc56daa013ad7c50c8953a3bae92c9a59436f73e4f2a4bd927d7bdee62
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A51 5048 bytes
font_01_sfnt_off00007b9d.bin
750032288465d07433c5f687df9589d890b1c5a6cc664d8653c84b7a56c5fc21
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9D 10632 bytes