Malicious PDF — malware analysis report

Static analysis result for SHA-256 a495bb0b983e0414…

MALICIOUS

PDF

36.6 KB Created: 2020-08-29 13:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7bb3deea47f8a5da41a35b7dbff468b SHA-1: 4c3f9c53a16160e5ba9425e4c956311bd9eabf67 SHA-256: a495bb0b983e0414b73601bcd11addbbfcbd3f47d93111603eb306e36ff44e7b
152 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.cc/wix?keyword=brincar+de+viver+maria+bethania+down'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly indicated maliciousness. The primary intent appears to be directing users to malicious infrastructure, likely for phishing or malware delivery.

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.cc/wix?keyword=brincar+de+viver+maria+bethania+down
    • https://static.usrfiles.com/ugd/b8c837_fdf468356f4840908b7707929b9d07a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_99cd530dd41948248b703be9429a89b2.pdf
    • https://static.usrfiles.com/ugd/73c254_764314e081844b9393fb60c550fccaf6.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4982/files/66067455508.pdf
    • https://static.usrfiles.com/ugd/d78803_e988b393dcdd4935aafbf1ce961d2944.pdf
    • https://static.usrfiles.com/ugd/b8c837_545d58b1651b46a18cf7f2d7318c0028.pdf
    • https://static.usrfiles.com/ugd/b8c837_5eed99d82ee74410ab42ccda4f97eaf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e7b6f4437a048e1b1b8aa2b02122d92.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d2868334ef3421fa222c0fc0c23f7ce.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_off000043cd.bin
54387879f6216bf3f3655f71a05f26c698e35589c8e130f3db6a6d5266a2d6b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43CD 5308 bytes
font_01_sfnt_off000055b5.bin
94f7f04c354b7c42189b541209bdac3d2056a6ae94e17fa8fbf2c94236be72ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55B5 1872 bytes
font_02_sfnt_off00005ea4.bin
31a51eeb720f6ce6c22496cc076598ce01d190d105d29b4ec99fae60ecc329f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA4 12136 bytes

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