Malicious PDF — malware analysis report

Static analysis result for SHA-256 6415d8962154761d…

MALICIOUS

PDF

81.0 KB Created: 2020-12-14 21:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abd9111d426f87608797d0bb0c458d64 SHA-1: 7780275f6ecac84a4e73331de9b1813837921062 SHA-256: 6415d8962154761de11ec4e2b7d26e6aef81b709e70e759e0d26f0296fdd87fd
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services and redirector infrastructure, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is part of a link farm or SEO manipulation scheme designed to distribute other malicious content or phish users. The document body is heavily obfuscated and contains metadata related to its creation, but no direct instructions.

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/123?utm_term=the+road+back+to+you+an+enneagram+journey+to+self-discovery+pdf
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/ffc40040a9e2.pdf
    • https://juluvolalo.weebly.com/uploads/1/3/4/4/134435755/sexirugim.pdf
    • https://xepajozojiv.weebly.com/uploads/1/3/4/4/134476610/bcd32ec5429a.pdf
    • https://duvinibekumexeg.weebly.com/uploads/1/3/4/6/134677329/f60c31c.pdf
    • https://nunezujotegu.weebly.com/uploads/1/3/4/3/134312528/2611767.pdf
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f876f38c9455.pdf
    • https://xosuloduviz.weebly.com/uploads/1/3/4/8/134890731/2177366.pdf
    • https://cdn-cms.f-static.net/uploads/4406809/normal_5fa376c9d35cc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc110906609fd0ee7923de0/t/5fc181cd9ee0f32b878c08a1/1606517198146/praxis_5017_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/c71fcab3-9b1a-469c-a0b6-138a10b9d883/demajelejelerekenavikezi.pdf
    • https://uploads.strikinglycdn.com/files/bcea4a5c-c05c-4a11-9c69-2299d3577f78/yann_tiersen_comptine_dun_autre_t_piano.pdf
    • https://static1.squarespace.com/static/5fc27e990a2757459bed0688/t/5fca9852e0f9ce029d071080/1607112795699/how_to_make_geometry_dash_on_scratch_griffpatch.pdf
    • https://static1.squarespace.com/static/5fc0e727ea4a794d5645064f/t/5fc649ec1972c46e3c748d1d/1606830572644/play_battle_bay_on_pc.pdf
    • https://uploads.strikinglycdn.com/files/fa141bc1-85fb-4372-8782-5d4189a43ecd/37459851378.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000117e7.bin
63fc79a3a68da17a35534460d5ddc741ed94385e5a7f97c24dd18e5d8005fcc0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x117E7 19256 bytes
font_00_sfnt_off0000ddde.bin
0a5bf45bb36348545f4deb7d5c0aa548d1b23ff395e28b5c656c25eb261b6944		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 5992 bytes
font_01_sfnt_off0000f233.bin
c0482679cb16cd4fd2ea55632e20dec1ca9f0b0fb9ae9b5beea5990fb39a27f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 11116 bytes

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