Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a4b354f192cb3d…

MALICIOUS

PDF

42.3 KB Created: 2020-08-29 22:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22d90d970e3bd0366d367dcb9a633b5a SHA-1: 672e4903e1a5f665008e78a8ed6c7076a7dc9122 SHA-256: 84a4b354f192cb3dc08a670c95406687b9e6647d3d702b6fe8eecbaad6cde95d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.me, which is disguised with a game-related keyword. This suggests a phishing or malware distribution attempt. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy, likely to improve search engine ranking for malicious content or to obscure the final destination. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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.me/wix?keyword=assassin%2527+s+creed+odyssey+esrb
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_0d2c6123146c4d618dc198f64f0fa3c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_6065188ab8e34fb9ba84f9bcf177a299.pdf
    • https://static.usrfiles.com/ugd/b8c837_20d1a84c056c40a3adf48572d03ab1c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_24a2109d6d6a4ef2a82f3fb2642d547c.pdf
    • https://static.usrfiles.com/ugd/f80014_7844e961bab04c9f8edfed1242699608.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc22890e19354a8c95a814f9dc2f3ac0.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb1e6880f2654da2884085ebdeb17af9.pdf
    • https://static.usrfiles.com/ugd/ace02d_3088a8d447ac43cfb955ddb69249e744.pdf
    • https://static.usrfiles.com/ugd/b8c837_a9c5e2d08c574af38a1e288aa41168c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_5eee86ec470147e69c592b2fc9c5d367.pdf
    • https://static.usrfiles.com/ugd/856cea_1861d1fc7e9d439ea7b76dc1dde2fda5.pdf
    • https://static.usrfiles.com/ugd/b8c837_117d75b6444e4070a4938bab2526fbed.pdf
    • https://static.usrfiles.com/ugd/2274a7_671ad0b14bbb46deb78b5b7fd7affbd2.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/rukafidazutev.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/hollow_knight_simple_key_locations.pdf
    • https://cdn.shopify.com/s/files/1/0431/9562/9725/files/37800013512.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006624.bin
655fc0fab5aa277ecc63ebb4a16d5d4a26a96ccbfd90871744a768e4c52d59dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6624 5168 bytes
font_01_sfnt_off000077c0.bin
39756c24dc1f7e6da155172f6283d93270ce72e753cc496347c73004c1b54a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C0 10860 bytes

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