Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2aacc4bb26f165…

MALICIOUS

PDF

56.4 KB Created: 2020-10-03 16:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d048ea65299a0c9329548cd0e568c822 SHA-1: dcf1e2aa8e92a548bd1b096839cd246bd23a80e1 SHA-256: 3f2aacc4bb26f1651570bc833d04349630d5a87d3111398ccedeaf0b96647909
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at `https://gettraff.ru/strik?keyword=dolphin+smash+bros+melee`. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=dolphin+smash+bros+melee
    • http://jalenos.drronmartinez.com/uploads/1/3/1/4/131453336/4667620.pdf
    • http://files.mandyyrosen.com/uploads/1/3/0/7/130738673/golurovoro.pdf
    • http://xonon.handplayproductions.com/uploads/1/3/1/1/131164250/gidijudakumuti.pdf
    • http://files.kiddworld.com/uploads/1/3/2/8/132816036/sojusuk-pakaku-xumubisig.pdf
    • http://files.khamby.com/uploads/1/3/1/3/131379042/kuzipad.pdf
    • http://rijiva.lightproofmedia.net/uploads/1/3/1/4/131408008/870485bc6.pdf
    • http://files.enrichsalon.net/uploads/1/3/0/7/130775050/5277391.pdf
    • http://fametowa.thekinkhub.com/uploads/1/3/1/3/131384552/wifubup-bopep-zagenoximut-sukekanuxatiju.pdf
    • http://wesub.mapsunearthed.com/uploads/1/3/1/3/131379846/8155234.pdf
    • http://samen.mrwildinghomeroom.com/uploads/1/3/1/6/131637881/324265.pdf
    • http://files.mytangledstories.com/uploads/1/3/2/8/132815892/f5257b2a.pdf
    • http://files.lenid-jugon.com/uploads/1/3/0/7/130740213/acda90201ccb836.pdf
    • https://uploads.strikinglycdn.com/files/63795a11-1d58-48ca-8b90-7942c491f6a6/44140003460.pdf
    • https://uploads.strikinglycdn.com/files/5eaaa5f3-d0e5-4d9e-87e6-39c1f713dbde/37769924642.pdf
    • https://uploads.strikinglycdn.com/files/49e1d506-5b1e-46dd-a02a-704222e9b637/zowakituzezitemodawe.pdf
    • https://uploads.strikinglycdn.com/files/6e02a426-65d9-4ec2-a4e9-2386bf15b5eb/78280287880.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079ca.bin
8c5992c0ffa933ae62a484455da99b56c15f9a2e1a3cb8df9952e80c33b88ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CA 4728 bytes
font_01_sfnt_off00008a33.bin
391a524eabbf907b5b54bd2a3f9bc1b42fd2600e006eadfba84c6bce0263e20f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A33 5200 bytes
font_02_sfnt_off00009bac.bin
c39e3f694c43c11d6796eb6b13ec2b91e1ee7af524e2dea4ed562f69876c5030		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAC 10256 bytes
font_03_sfnt_off0000bf08.bin
10572f3a10760712fbb8352e098d229fd21f48763f52fb6fd9385479015ceb58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF08 16060 bytes

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