Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4caba69e884c5b…

MALICIOUS

PDF

47.5 KB Created: 2020-08-15 04:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3d8a1a470c991ae60108c40fd11cfb1 SHA-1: 6a50e7e9b35efb96c9bf9d71dc02a8e893582151 SHA-256: 0a4caba69e884c5b3e4ff3aeee24607df11c684c7fbf8acc626b8778da586126
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The ML classifier also strongly indicated 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.cc/pify?keyword=greased+baking+sheet+in+spanish
    • http://files.sisterfriendlyproductions.com/uploads/1/3/0/7/130775370/jexosos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/tefiked.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/arithmetic_and_geometric_series_word_problems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/20016143693.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0448/3586/4736/files/tewadesazadimopuwasuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/3509/7245/files/arduino_obstacle_avoiding_robot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92702877098.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ganisififado.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0408/files/gawiwoz.pdf
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/9762215439.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/15420608009.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9434/files/dion_waiters_injury_report.pdf
    • https://cdn.shopify.com/s/files/1/0444/5110/2887/files/nxstage_system_one_manual.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_off000064e8.bin
018223b03a243f65da904cd7e4d7e56d1dd3f802fc365dbbf7ea70814f2c9ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 5424 bytes
font_01_sfnt_off0000774c.bin
57e602344934c36d057a9c7368a408a0918fded053cec66bb8fa7155a10013c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774C 10952 bytes
font_02_sfnt_off00009bff.bin
687267c9c3db9c7ba5925ba46e702bad05deca9442433a35c4d1c7c9873e4b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFF 16068 bytes

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