Malicious PDF — malware analysis report

Static analysis result for SHA-256 516be583595f6ac8…

MALICIOUS

PDF

80.7 KB Created: 2020-11-11 14:54:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 614d64aa9b37b0feeafbc02a090e2b0e SHA-1: 1cc12735c0626026af31ac8fbef1dd35424f7ba9 SHA-256: 516be583595f6ac82568e9cd0469b135121bd71e594cc2f33ad58cba20d20b45
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files hosted on various disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-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://gettraff.ru/aws?utm_term=cool+math+games+unblocked+66+moto
    • https://pasukanat.weebly.com/uploads/1/3/4/4/134474220/7f8c7.pdf
    • https://nazaxefuv.weebly.com/uploads/1/3/4/5/134589683/5719920.pdf
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/3946401.pdf
    • https://gemegomuzek.weebly.com/uploads/1/3/4/3/134339500/japefojoju.pdf
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f881695ed1e7.pdf
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5fa530ca60aa8.pdf
    • https://sewiwojura.weebly.com/uploads/1/3/4/3/134371681/xupuxanejokiros-bazipud.pdf
    • https://nevijajemiwawo.weebly.com/uploads/1/3/4/3/134340376/sujoloket_venumad.pdf
    • https://foduxami.weebly.com/uploads/1/3/4/4/134452333/kukak-letebenok-tonowemejato.pdf
    • https://zagesugob.weebly.com/uploads/1/3/4/3/134379314/lakob_zafafej_milux_kimelu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0ed0aabf-01c2-420e-b253-c7fe3fd6303d/gokizogu.pdf
    • https://uploads.strikinglycdn.com/files/e602e857-5b1f-424a-89b0-c57e8bed454f/fotuvilazadafifanokulu.pdf
    • https://uploads.strikinglycdn.com/files/fda593b8-320f-4eb8-92a0-32da68a20750/27543581342.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da52.bin
adc912fd216e5e9919e0365d08b3bced6a7908f0c5eef1345b52dda984989f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 5520 bytes
font_01_sfnt_off0000ece8.bin
393694cb9666c3d5dc30b48782059b649c6db43b830fd310b9d95ea6716430c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 10976 bytes
font_02_sfnt_off000110e6.bin
ed4d2d8392d2ed16fa53cbc9d27fd08a976597c3a21a1bd3b5d7c252e787f23d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 21624 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.