Malicious PDF — malware analysis report

Static analysis result for SHA-256 844c996776a5d4aa…

MALICIOUS

PDF

40.3 KB Created: 2020-07-09 15:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59ea657c664c3b9e3acd56a41b0dc88f SHA-1: 393523c4b4d03fe33da02ba87acb576bba7c3e3c SHA-256: 844c996776a5d4aa429a93ad5f04c72bfb92b574706afb1ba0e7012dab81a597
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDFs hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One prominent link directs to 'https://ttraff.com/wb?keyword=cf%20manual%20patch%202018%20download', which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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.
  • 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://ttraff.com/wb?keyword=cf%20manual%20patch%202018%20download
    • http://files.holisticdiscovery.com/uploads/1/3/1/4/131437699/foxuxubaguf.pdf
    • http://files.ldblc.net/uploads/1/3/1/4/131452870/4d86a16b79.pdf
    • http://files.victoryacresfarm.com/uploads/1/3/2/7/132740593/8477352.pdf
    • http://files.vwmoriarty.com/uploads/1/3/0/8/130873895/1223947.pdf
    • http://files.christiancounselorcooperative.com/uploads/1/3/2/6/132681343/jokufobovodijuw.pdf
    • http://files.exmouthcaninecentre.co.uk/uploads/1/3/1/0/131070379/612343e61.pdf
    • http://files.ikargb.co.uk/uploads/1/3/1/4/131409170/c416f2d8c877.pdf
    • http://files.tireservicesolutions.com/uploads/1/3/1/6/131606673/4609047.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kumuderaxumi.files.wordpress.com/2020/06/zudewodezowesas.pdf
    • https://topafajanew.files.wordpress.com/2020/06/lozapigotuxafir.pdf
    • https://gatunoxidi.files.wordpress.com/2020/06/21864417285.pdf
    • https://josejoxoboko.files.wordpress.com/2020/06/33342753946.pdf
    • https://zojaxatij.files.wordpress.com/2020/06/toxixe.pdf
    • https://bonezedumi.files.wordpress.com/2020/07/14528573110.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovonuvebapade.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000556d.bin
ec0260a671e1a1d6cfe7890d11363cc20dbca560396075cc904728ac31fcc7de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x556D 5472 bytes
font_01_sfnt_off000067f3.bin
4e157f32b72e4f4c85ebe6ff2816c64f7fd0aea46d4432a0372f8b79e5f0ca48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F3 14408 bytes

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