Malicious PDF — malware analysis report

Static analysis result for SHA-256 0721736541e722bd…

MALICIOUS

PDF

42.1 KB Created: 2020-10-06 18:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e32b304763b322542964127e9da93060 SHA-1: 468e43b375276155a21a5cd1d1b89d86ec76171c SHA-256: 0721736541e722bdec06d2f59eee2c284f34a53ca0b9f70d748510ee2a144c2e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a pattern of hosting or linking to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious infrastructure, possibly for phishing or malware distribution.

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://ttraff.club/pify?keyword=troy+bilt+mower+tb200+manual
    • http://files.basilelimeade.com/uploads/1/3/1/4/131437401/e06d96.pdf
    • https://site-1037275.mozfiles.com/files/1037275/93631650178.pdf
    • https://site-1043691.mozfiles.com/files/1043691/89095556885.pdf
    • https://site-1036742.mozfiles.com/files/1036742/rewupumenufem.pdf
    • https://site-1037219.mozfiles.com/files/1037219/37715292153.pdf
    • https://site-1036826.mozfiles.com/files/1036826/43255211540.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c6fb5fb4-ded3-4e56-ab67-a3f3cb1505cd/karivozosobuj.pdf
    • https://uploads.strikinglycdn.com/files/10a7e811-b3f9-4a28-985a-041809f2a2ce/86185734195.pdf
    • https://uploads.strikinglycdn.com/files/2c85c28e-7df3-4881-ab12-d5173ae0c7cf/95274919899.pdf
    • https://uploads.strikinglycdn.com/files/a3caaa40-7e63-4dc1-9ff0-5d124a7ca29f/7690158945.pdf
    • https://uploads.strikinglycdn.com/files/4df74036-2f51-4074-a98f-e9fcdd0ffe9c/radowifonagugewo.pdf
    • https://uploads.strikinglycdn.com/files/25d6fafd-9d5b-4dd8-9f5b-f5ae47c9c959/2940445861.pdf
    • https://uploads.strikinglycdn.com/files/1069c252-dc8d-4327-b88c-74b1673e2354/xavenirumipubesi.pdf
    • https://uploads.strikinglycdn.com/files/07519647-2ce1-431e-92e4-a2b280b2642c/zekevu.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_off0000671a.bin
366d620b41c1281bc9e2a0843bd0a1bca78596368b82eaa7d07cac581f1657e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x671A 5208 bytes
font_01_sfnt_off000078ce.bin
2b400e3443ac0c6425fb32ed4b87d1206bb848bbe94542cce06bc098e0218ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CE 10256 bytes

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