Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afbba583095779b…

MALICIOUS

PDF

59.5 KB Created: 2020-11-19 23:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92afd644e85f9fb88ecf90dcae3d752e SHA-1: 198f1464a828a5a26ff102b03a08709bc9088008 SHA-256: 1afbba583095779bab63da2f9cf963e8b4feafd3ecd3eeb4ebf342d6b8980720
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many pointing to external PDF files, indicating a link farm or distribution mechanism. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=columbia+county+ar+landfill
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/04ac323ba38.pdf
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/vepuseged_fezexegux.pdf
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5fa683ad19d0a.pdf
    • https://jadimakadafi.weebly.com/uploads/1/3/4/3/134378671/4597717.pdf
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/7836499.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vapelurowar/53208634518.pdf
    • https://uploads.strikinglycdn.com/files/c9b86719-da8f-40b5-81e3-4925532b5bb1/sekiro_ending_guide_spoiler_free.pdf
    • https://uploads.strikinglycdn.com/files/e34b45a5-bcc0-4e3a-8a5d-edd5bed94989/memugazabegojov.pdf
    • https://uploads.strikinglycdn.com/files/c5b81d7b-caf3-4a9a-8deb-f976c10d8b69/wezabeme.pdf
    • https://uploads.strikinglycdn.com/files/471af1a2-13e8-4edd-b288-97ce69eadc77/gamecube_emulator_for_wii_homebrew.pdf
    • https://uploads.strikinglycdn.com/files/7d61d310-d83e-4253-8899-fb369beebe57/fatesev.pdf
    • https://uploads.strikinglycdn.com/files/2f05e5c2-3a5e-4bb9-b513-2b3d2d6f8205/jiliresoronibosa.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_off0000acc5.bin
686f8021d03273b229e55932ed0c443cef644cffe32f2ed5dcdbfc3f0a0d1ca5
pdf-font-stream PDF embedded font (sfnt) at offset 0xACC5 5136 bytes
font_01_sfnt_off0000be27.bin
d5d5877585ab943a61b6a4b7fb4dc823a1f9fa24c3580357a8584ff9e14c37ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE27 10272 bytes