Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e7daacce755cf6…

MALICIOUS

PDF

35.5 KB Created: 2020-09-01 14:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c9f768bde42729d6a0fb8c79f717ef2 SHA-1: 2ee26d8ec7b85eb1b48e4e69f52f24a8a32d6c85 SHA-256: a6e7daacce755cf6851aa760ada97f5c5f5de54f3784ef76f3a09282a404f5bb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one critical link pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains this URL and references a legal case, suggesting a lure. The presence of a link farm heuristic further indicates malicious intent to distribute links. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=gideon+v.+wainwright+icivics+answers
    • https://cdn.shopify.com/s/files/1/0431/5136/0164/files/manual_biblico_nelson.pdf
    • https://cdn.shopify.com/s/files/1/0435/8632/2600/files/72627650022.pdf
    • https://cdn.shopify.com/s/files/1/0438/4981/0070/files/14393392369.pdf
    • https://cdn.shopify.com/s/files/1/0435/5702/8001/files/agile_project_management_handbook_v2._0_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9f18cad06e041a6baedb4428c042c3d.pdf
    • https://static.usrfiles.com/ugd/12f4eb_b7b8f769ead74f6d8cf8ce549f2d0ffc.pdf
    • https://static.usrfiles.com/ugd/2ac701_d218b4e1dfdc47e0bfcc867637c6c467.pdf
    • https://static.usrfiles.com/ugd/b0b521_5454208972d24a668bf18e9bae278909.pdf
    • https://static.usrfiles.com/ugd/8de238_b84196f6b5324a8097fb5759137de4c1.pdf
    • https://static.usrfiles.com/ugd/0bfb20_72dd2f7566aa47f9a3a6c1cec894a28a.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d91.bin
8bb16e2b4ec7cadccf7df985ff6b0f597e293f5ec5e580a231d58cf9dd54a680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D91 5384 bytes
font_01_sfnt_off00005ffc.bin
bce82e9e19090448540512ca425e038ee2ae7dcb77397253f0104419cea09614		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFC 9840 bytes

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