Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0962cb6e3243691…

MALICIOUS

PDF

63.2 KB Created: 2020-08-19 14:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1862ce48570fab8015bda6efbbcd5b6 SHA-1: 3a2cea2c1072d39b17b3ea68c364f993edb2e682 SHA-256: a0962cb6e3243691d9898bc8158cc5aac80bc612321c8d7032e844d45769cfd4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the final destination. The ML classifier strongly supports the malicious nature of this PDF.

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=expression+of+interest+letter+template+project
    • http://zovinu.socalbiblestudy.com/uploads/1/3/0/7/130775634/4811712.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/68278124683.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/87365831544.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/top_and_bottom_tumblr.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/62079160298.pdf
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/71085141162.pdf
    • https://cdn.shopify.com/s/files/1/0438/9617/6795/files/bofokokaxujosom.pdf
    • https://cdn.shopify.com/s/files/1/0437/9839/7085/files/dajupikazabasul.pdf
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/bexoruxeboriwigotifimoxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6722/7811/files/barangay_clearance_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/2848/0163/files/kileluraxulemom.pdf
    • https://cdn.shopify.com/s/files/1/0436/1738/6659/files/liberation_war_of_bangladesh.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af39.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF39 2828 bytes
font_01_sfnt_off0000b934.bin
7cf089ab9097edb0173fd0883d8f3d0d32ae8601dfee133549f7d463a6383ad6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB934 5264 bytes
font_02_sfnt_off0000cb07.bin
376514560b6f6daf69b76b76fcfb7ff7dc3c6c7b1befbc76ff8830e6f84eb8bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 9992 bytes