Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6b5739d2ebcab6…

MALICIOUS

PDF

64.9 KB Created: 2020-08-23 08:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f40a3a356a06a0d91702e6caa1f6fcd2 SHA-1: 3cf3706672518e06160a104df4ad01ec7f1b794e SHA-256: 2f6b5739d2ebcab64e7d9ee108588ae98593e66fd048b1d273ec2ed09c47408e
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The ML classifier also strongly flagged this PDF as malicious. The embedded URL points to 'ttraff.cc', a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. No scripts were extracted, and the document structure itself is the vector for the malicious link.

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/pify?keyword=byzantium+guide+eu4+1.+28
    • http://files.marthacallisonhorst.com/uploads/1/3/0/7/130738928/3695096.pdf
    • http://files.austinformichigan.com/uploads/1/3/1/3/131380895/67dd6.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/69391134036.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/dojuwufuxigiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/html5_viewer_open_source.pdf
    • https://cdn.shopify.com/s/files/1/0437/1477/3141/files/teripebawovajogez.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6647/files/78562288109.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3757/files/xokunosonorazular.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/80253734359.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/sabijewalodoninefuve.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0555/files/pufesolagiriravigufurona.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_off0000c0dc.bin
e471968305d6fcc625d5bebab42cc7ec342771e36bdff51741fc7fd6d8cce819		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DC 5536 bytes
font_01_sfnt_off0000d3bf.bin
50028a5947227f19f4af422d1c3c9ead999817fbb6587325a7431508c48caf67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 10352 bytes

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