Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76c5735d1f1c080…

MALICIOUS

PDF

41.3 KB Created: 2020-08-24 08:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 221311f73ed53f001f482d4a9168e6bc SHA-1: 8998740aae0fff053d4584ab222be7c33f16c7e1 SHA-256: f76c5735d1f1c080433906d79d16937937b0baaa75280842c610aa2aec7103a5
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its inclusion of a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=drill+guide+jig+tool'. The document body, though heavily obfuscated, contains this URL, suggesting a lure to external content. The presence of numerous links to Shopify-hosted PDFs, while some are benign, contributes to the overall link farm characteristic.

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=drill+guide+jig+tool
    • http://files.ellwoodcitymetz.com/uploads/1/3/0/9/130969354/wosamobabijob_nabaziradoxisa_bisaneberux_nagevoju.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5230/files/jolevumepalanap.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/nekilota.pdf
    • https://cdn.shopify.com/s/files/1/0431/1475/8293/files/83479354962.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/pelajodufokobusetetar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32150460784.pdf
    • https://cdn.shopify.com/s/files/1/0438/9689/7704/files/82393156883.pdf
    • https://cdn.shopify.com/s/files/1/0430/1871/5289/files/27421872130.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4634/files/rifumokidotewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/28045298780.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_off000063d6.bin
b9a9776fa19f39bf5f976ebbb43c55a5d135276149a36dc394175cc30bfc8beb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D6 4680 bytes
font_01_sfnt_off000073d1.bin
a9ac4ec2c9fb499fa681c92b1d8a90f189d7ef9fe7851d9f8ec8ffafb4b6c9e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D1 10736 bytes

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