Malicious PDF — malware analysis report

Static analysis result for SHA-256 f854fe46d0d53c3a…

MALICIOUS

PDF

40.3 KB Created: 2020-11-03 14:36:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 645ca22f4a8284a3c5c156c8d35f4960 SHA-1: 7b51f4cdcf8a33d694558bdf6df79802da4510e8 SHA-256: f854fe46d0d53c3a27185e43865a59010b62a7aa05413c4368b7da88055c2723
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this is a link farm designed to redirect users, likely for SEO spam or to distribute further malware. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ttraff.ru/123?keyword=montagues+and+capulets+feud
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/vibagevuwevarix-safiwamivabu.pdf
    • https://povilaromegew.weebly.com/uploads/1/3/4/4/134486615/1ce3e5a486a0.pdf
    • https://cdn-cms.f-static.net/uploads/4403271/normal_5f9d4366c533e.pdf
    • https://cdn-cms.f-static.net/uploads/4402519/normal_5f97da182120b.pdf
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/2f1a94860071.pdf
    • https://fozafilamo.weebly.com/uploads/1/3/4/3/134314768/piwenef_biregamakim_nebakeliwegonon_biseribuzos.pdf
    • https://fiwisiroveton.weebly.com/uploads/1/3/4/3/134339953/4915525.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/120b7736-bd94-4359-a274-8d50da578ffd/jigsaw_saw_movie_quotes.pdf
    • https://uploads.strikinglycdn.com/files/be91790b-697d-4a6d-b203-254dc50c398e/83937825758.pdf
    • https://uploads.strikinglycdn.com/files/59fdcc95-042d-4664-b221-28e575142f32/nitujelogefumara.pdf
    • https://uploads.strikinglycdn.com/files/d69ef068-f311-4a3c-b7c6-0af6138e32f1/matunalowufomupatuj.pdf
    • https://uploads.strikinglycdn.com/files/9d0e5c13-dd7a-4d6c-ad3c-4434e031277c/32639387731.pdf
    • https://s3.amazonaws.com/pazifetanegapu/fasesubijutujoweregejas.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_off00005fe1.bin
62a04e030c7f143877b172b7b1d77ca4148d685b7959385d03677db0ae9d29e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE1 5232 bytes
font_01_sfnt_off000071d6.bin
eccf847de141eedf8c89ff224fe8acea307185c3c92b15606589974a72891bc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D6 10204 bytes