Malicious PDF — malware analysis report

Static analysis result for SHA-256 42efade1214d66c1…

MALICIOUS

PDF

41.5 KB Created: 2020-11-04 02:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b545bed3787c2764e55b71ee49b4e280 SHA-1: 1778b3789c64c99b25e04a8ed1c87d8df3eff4ef SHA-256: 42efade1214d66c1d4d0ef2d3dbd7f985e36ae113847a14bc26c64fc1850f86c
154 Risk Score

Malware Insights

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

The PDF document contains embedded links, one of which, 'https://gettraff.ru/strik?keyword=yahoo+mail+is+not+working+on+chrome', is flagged as a malicious redirector. The document body, though partially corrupted, also contains this URL, suggesting an attempt to lure the user to a malicious site by posing as a solution to a common technical problem. The presence of numerous other PDF links further indicates a link farm or redirection strategy.

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=yahoo+mail+is+not+working+on+chrome In PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/7d7b6617ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f8ca311e9615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f8733fea31f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5f8820db1a0cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f876013461e1.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/9014342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452381/normal_5fa0a102c46c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f98d4f6210f3.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/kodupig-pujumobegen-vuvabun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a4cca5-5685-496a-9e0e-4cd642caf2bd/66126267206.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/pivebuvevikuvuxekekikon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e371ae-ded3-4518-89bb-ac3468f1d9fe/21790273000.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/hack_android_games_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/17385525469.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000644d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x644D 5332 bytes
SHA-256: f2018967bc7e976f9d3a683e6116106e4261c70e6220eaa768198074b72e8682
font_01_sfnt_off00007659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7659 10260 bytes
SHA-256: d3b28a03871bad0903f8116b753d919db1b916b3101926cf0e54e8175c156228

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