Malicious PDF — malware analysis report

Static analysis result for SHA-256 67fafbdbb873948a…

MALICIOUS

PDF

48.5 KB Created: 2020-08-19 01:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03014ec0a4ed2af160c4abec9d830507 SHA-1: f3eb62419aba3493d16144e5d8228b90fe5de41b SHA-256: 67fafbdbb873948ab4e4c62419c3c86b08e63326cf0458c9c72c15bb22a1c5c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to a link farm hosted on Shopify, which is a tactic to obscure malicious redirectors. One such redirector, 'ttraff.com', is explicitly flagged as malicious and is used to funnel users to potentially harmful content. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting an attempt to lure users with a fake software download. The ML classifier strongly indicates maliciousness.

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=avg+free++win+xp+32+bit
    • http://files.pris-t-gis.com/uploads/1/3/0/8/130814101/020118001f4edd2.pdf
    • http://files.ddoughty.com/uploads/1/3/2/6/132681201/8d3122912.pdf
    • http://wubakokis.trialinnovations.com/uploads/1/3/1/8/131856935/9413193.pdf
    • http://files.bolivarcoc.com/uploads/1/3/2/7/132710783/03a669b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6374/6453/files/charge_blade_combos.pdf
    • https://cdn.shopify.com/s/files/1/0459/2287/7591/files/65396098862.pdf
    • https://cdn.shopify.com/s/files/1/0437/7251/0362/files/43619339988.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalajenoderemomepofelefa.pdf
    • http://nizasote.ninepincider.square.site/uploads/1/3/1/0/131070420/sixepiridifesel.pdf
    • https://cdn.shopify.com/s/files/1/0432/7905/7056/files/14565865975.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/pinidubusubujobivirawe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/10134336700.pdf
    • https://cdn.shopify.com/s/files/1/0432/5123/7032/files/vuzaginabebidejedodozesi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niwaragevutaxesidep.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/intel_processors_performance_order.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000694c.bin
c41c3581e0fbd08fb0196546a0fd22b5829aaa3077026fb831929eb2adc35200		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694C 5296 bytes
font_01_sfnt_off00007b85.bin
9bee32feaefe0aaea7398c8f174959714b8655f3a0a7fe279f244e4a5afbff88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B85 10512 bytes
font_02_sfnt_off00009f68.bin
d2d14ee152591f1391b9c182731dc81228c2f3de4d706c9bd7d93c14ae925181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F68 16144 bytes

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