Malicious PDF — malware analysis report

Static analysis result for SHA-256 606043c44bad21ed…

MALICIOUS

PDF

87.3 KB Created: 2020-11-04 01:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 96b72a123e4ae00482043d2cdd03327d SHA-1: d3b0d1e3367248fd37d44b77e921bb21152ad08f SHA-256: 606043c44bad21ed8cb9f0d85f1a98342a97a6691799bb28c574cfbceb73aa9e
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ggtraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous embedded PDF links further indicates a link farm or redirection strategy.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ggtraff.ru/strik?keyword=your+boss+calls+you+from+the+road In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5f91a8a0926b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_5f972cbecbf44.pdfIn PDF document text
    • https://kuvikupomudu.weebly.com/uploads/1/3/4/4/134457818/vewuleko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5f9e38438425e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_5f92b3a001818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_5f914fac5c9f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f96878c70add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f931616b8639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_5fa0cc8353702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f8f16c48e0c0.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/1582180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/bati_801_gta.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/contemporary_linguistics_o_grady_6th_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D5 5192 bytes
SHA-256: 49c2a7a6943c66af50399e9a854536650ba56228add2873d9ffceddc4dcf0095
font_01_sfnt_off00011a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8B 11488 bytes
SHA-256: e64825d0adcd10ebf102c7bc9ac5518d7d06e21c2ed649f5020d1b8e8373005c
font_02_sfnt_off0001417a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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