Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9308d3851cfa102…

MALICIOUS

PDF

68.7 KB Created: 2020-11-17 16:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c76fe164c8f74b8a81aec5551b740f5b SHA-1: d23e2531816bbcc5decd28b9843ab1e8a8a00699 SHA-256: b9308d3851cfa102676bb1659327743866f5f66fe48819c1b15bac672951ad5d
214 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically identified as a malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=shards+of+the+exalted+dream+pdf
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/b8cebd55a33.pdf
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f8a14feee59b.pdf
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f980da965500.pdf
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/c24c53be8c9523.pdf
    • https://cdn-cms.f-static.net/uploads/4417523/normal_5f976667e15f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/931ae79b-d584-4dc1-97da-18055873539f/wurasivuzino.pdf
    • https://uploads.strikinglycdn.com/files/6346af78-d677-4a63-913e-c9ccef32c6ca/79782761035.pdf
    • https://uploads.strikinglycdn.com/files/eed93e2d-1a91-44b9-a8b2-ac155cd4b11b/5e_dungeons_and_dragons_players_handbook.pdf
    • https://uploads.strikinglycdn.com/files/6cdb8b09-af22-41cf-b604-27cc7bdd33da/42350458221.pdf
    • https://uploads.strikinglycdn.com/files/2ca4e45f-a6e3-4eff-ba0f-f9f081494634/how_to_chubby_bunny.pdf
    • https://uploads.strikinglycdn.com/files/4abffa1e-d822-49e9-a360-0da33b693a14/bobenibakel.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_off0000cd5f.bin
e8398e528eb43868f3e8a67dae6c0257d24eaf444be94222257e6920d0a936fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5F 5452 bytes
font_01_sfnt_off0000dfc7.bin
dccaaceaf2fe9525a50dde61bedbbe36f217ff9bc12e072e57255cb84644fd74
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 11128 bytes