Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fcc91e01edd659…

MALICIOUS

PDF

48.9 KB Created: 2020-08-29 14:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e833c383b4fda88af9cc0e8a8ed1316f SHA-1: 7dee712968afd09609e1b83c917154ef7570040c SHA-256: c4fcc91e01edd659cbd22b792d939068513b822ea612502b2b7271fef68df729
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=navy+paternity+leave+instruction'. This URL is embedded within the document body, disguised as a paternity leave instruction. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive document, leading to a malicious redirector.

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/wix?keyword=navy+paternity+leave+instruction
    • https://static.usrfiles.com/ugd/b8c837_fdac5216c419411fbf86e9ccc374eabb.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d10fabd072346dda4cf7dba52b25347.pdf
    • https://static.usrfiles.com/ugd/4dd980_243859771b2345ba98fa855a8c4e3f5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_72ebf9c5e16540a4b39fda9a22bbf247.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d3cd954f1da4bada83340c99be8475f.pdf
    • https://cdn.shopify.com/s/files/1/0440/9756/8920/files/lagemijuka.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/new_vocations_thoroughbred_rescue.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdcfd85f4cf94ac19686e48e7022ee2b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1df06a60e2a0448bb8c8dd8cb523d366.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c2b4949788c4213a65bdd99df67cc4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b379de2e3ad4784b77d7e57621d9fbe.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdc68ab677094992b90dd8102f17587a.pdf
    • https://static.usrfiles.com/ugd/b8c837_876449ef327f4cc7a744b2149235bcaa.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa86e560b5d84967a8f05fbf899b2897.pdf
    • https://static.usrfiles.com/ugd/b8c837_fba2452068a84ca7a8008921feeaa2fe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007631.bin
a7bc2692bd63ce3a153ab0229876df60842cbd722f7f36bd38f07a95f49c7e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7631 4940 bytes
font_01_sfnt_off00008710.bin
31fbfe8751912129cbf2f17fadf2d99d05d09a90fa4a86c892800b16b54dcf76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8710 9788 bytes
font_02_sfnt_off0000a89b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA89B 4324 bytes

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