Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee342b51893d9d5…

MALICIOUS

PDF

38.5 KB Created: 2020-07-08 12:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c3af71267f9eb2eba50cc193aa57dba SHA-1: 46dc9d5851bc024e8012277540d991f98b1b904f SHA-256: 7ee342b51893d9d57593d6e75eb1fba81a7188ad625ad14b13c88d0444813824
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files hosted on numerous domains, many of which appear to be disposable. One of the primary links directs to a known malicious redirector infrastructure. This suggests the document is part of a link farm or SEO manipulation scheme, potentially used to distribute malware or phish for information.

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.
  • 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://ttraff.cc/wb?keyword=patterns%20worksheets%20grade%206
    • http://files.acrylicdreams.com/uploads/1/3/0/8/130813668/gutilixozewamu.pdf
    • http://files.printslinkphila.com/uploads/1/3/1/4/131482892/8978254.pdf
    • http://files.waiheelimu.org/uploads/1/3/1/6/131607174/nomuvawezilamaranu.pdf
    • http://files.duanebrownlaw.com/uploads/1/3/1/4/131483253/2887604.pdf
    • http://files.kelownaplumbingsolutions.com/uploads/1/3/1/3/131398156/vudejinu-kedav-benosagulita.pdf
    • http://files.jamesmatthewwilson.com/uploads/1/3/1/6/131637057/d1e23bb.pdf
    • http://files.michelsphotos.com/uploads/1/3/0/9/130969819/6647722.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xemifunofu.files.wordpress.com/2020/07/17844963759.pdf
    • https://temutexi.files.wordpress.com/2020/06/91310281548.pdf
    • https://tesovowato.files.wordpress.com/2020/06/87236965870.pdf
    • https://naganaf.files.wordpress.com/2020/07/lawugemiwitakozujajivin.pdf
    • https://bazolexadole.files.wordpress.com/2020/06/direwo.pdf
    • https://dofumotajefi.files.wordpress.com/2020/06/marewi.pdf
    • https://forakij.files.wordpress.com/2020/06/26575176526.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_off00005a2c.bin
90c0d630a90dfa470b95f301d85cbaae722657b06ed4c20697bac556967c3528		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2C 5108 bytes
font_01_sfnt_off00006b85.bin
3d2dfe7c925abb43b8d9f5f65997cfdc689c1dde243c86992ff3c1b9c7d12962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B85 9952 bytes

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