Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8d9b3dfaad1ef6…

MALICIOUS

PDF

42.4 KB Created: 2020-08-19 05:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd9931270baf33ab674bc8578f817083 SHA-1: d776d8ea9c12324f5b200819e90ffbac3a7b7742 SHA-256: 3f8d9b3dfaad1ef6b2a400c1ee4ff2f72562fe95df8844ef37d3afcc81474ca2
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 'ttraff.ru'. It also exhibits a PDF link farm, with many links pointing to Shopify domains, likely for SEO manipulation. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=attestation+de+formation+informatique+pdf', suggesting a lure related to IT training certificates. 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.ru/pify?keyword=attestation+de+formation+informatique+pdf
    • http://rogegilur.tintanegrahtx.com/uploads/1/3/2/6/132682156/179afcfc.pdf
    • http://files.tylerosburn.com/uploads/1/3/0/7/130775245/3f6b083d439.pdf
    • https://cdn.shopify.com/s/files/1/0447/9811/6006/files/resonance_circuit_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0441/1473/9352/files/domib.pdf
    • https://cdn.shopify.com/s/files/1/0434/9768/5157/files/11375606325.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/32975024731.pdf
    • https://cdn.shopify.com/s/files/1/0431/3917/0466/files/software_architecture_patterns_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/timavofusobutidokoxitogex.pdf
    • https://cdn.shopify.com/s/files/1/0428/3983/4780/files/zaxepawavetir.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/wizafinebepowitejikagejo.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_off000063cb.bin
4055932681bc58c353a6fca0b7efaa596b5f07c3ab0af0ebc8716bbe78eef66f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63CB 5272 bytes
font_01_sfnt_off00007594.bin
fb1315d303b91d148b54faa4ba95185343a3890ab923445073fcc517ea12e279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7594 11712 bytes

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