Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aff84b2dcb3628e…

MALICIOUS

PDF

72.1 KB Created: 2020-11-24 11:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4680d9eccfcef2372006d1311ff8aa49 SHA-1: 18b18a87afc4131bac1c5f6b0901b2c554da4dfe SHA-256: 8aff84b2dcb3628ea26d50e20cebce355a79038af1a43ced566126e8c4e2ed48
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily truncated and containing non-readable characters, appears to be a lure related to a book title, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of numerous links to disposable hosting and redirector infrastructure points to a campaign designed to lead users to malicious sites.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=business+research+methods+international+edition+9th+edition
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f87a4291d8e0.pdf
    • https://zijananuwale.weebly.com/uploads/1/3/4/4/134438714/xuvijefazasitul.pdf
    • https://xemawegomefere.weebly.com/uploads/1/3/4/7/134736207/2785938.pdf
    • https://sivanijizifi.weebly.com/uploads/1/3/4/8/134848714/aa1fd1.pdf
    • https://ganajefij.weebly.com/uploads/1/3/4/8/134884795/7813332.pdf
    • https://dakovogusuzulex.weebly.com/uploads/1/3/4/5/134595229/3723224.pdf
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/9748914.pdf
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/lazejiwe.pdf
    • https://cdn-cms.f-static.net/uploads/4424692/normal_5f98dc25f008a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/18c2f5a0-d619-4acf-99d1-24c27cd92fb1/us_indicia_status.pdf
    • https://uploads.strikinglycdn.com/files/0df10ec6-fd67-4c01-9b9d-836b5daedeba/95625539244.pdf
    • https://uploads.strikinglycdn.com/files/d58453fb-0256-4ba4-847c-272d21b0080a/free_potting_bench_plans.pdf
    • https://uploads.strikinglycdn.com/files/db194a02-a47c-4e94-9e77-8bfc5e89fac1/86437562606.pdf
    • https://uploads.strikinglycdn.com/files/26f80f7a-24f9-4034-80b4-7f1be27bce02/pejudedufo.pdf
    • https://uploads.strikinglycdn.com/files/d563d951-62f6-4961-8200-fe2971237812/mi_6_helicopter_wikipedia.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_off0000dd53.bin
fdb3bfe4f56103154292c2d8382bacff00ffcc1c36ad4ce33a19492334c41e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 5384 bytes
font_01_sfnt_off0000ef73.bin
4db6ce87dada9e935c09b1e86ff973737c8231bad52ca8ca8f425915befa5694		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 10320 bytes

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