Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f04dc75e18e9c73…

MALICIOUS

PDF

39.8 KB Created: 2020-08-22 02:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cb2c3d5b5bd94cc25712a3211d4d6a9 SHA-1: 17a81910669d8bdd043af53ad102ace06fb0b948 SHA-256: 6f04dc75e18e9c7340dcec8d2fc81d72b4b7a808d19cee739f64743fd8496c7c
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. 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.com/pify?keyword=beautiful+pictures+of+the+world
    • http://wulol.crestwoodexplorestheworld.org/uploads/1/3/0/8/130814328/4831f9d2.pdf
    • http://files.spiritofpeacemilw.org/uploads/1/3/0/7/130776526/kubekexowigeto_torukeridobaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/83091832438.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4846/files/asus_usb-_bt400.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/jotima.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/turedobulotimotunati.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/14441212930.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/57798877006.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4179/files/musorogozezoxoxolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/nuxavozak.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1239/files/nubosadoxawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3976/files/30282575810.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/42157910556.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_off00004370.bin
4c5d82bf823590a3c0272d379e1eeff24c20419c86a55b32a6da1ad11d0ad79b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4370 5384 bytes
font_01_sfnt_off000055c2.bin
f2853f90f9b49de14555b98ef4d7d8f9a43db21d66c7f0f08837b1d730970ef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x55C2 9652 bytes
font_02_sfnt_off000076f3.bin
b50697107089b3b99fd4bb4d1d478d8cdf1451ebcc2d00f5d636114b2a25aa3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F3 17996 bytes