Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bb3fbd5435bec9…

MALICIOUS

PDF

45.5 KB Created: 2020-08-30 10:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2859d06035ed433371bad9b0a3180d92 SHA-1: 119d224f2992c554c7edd11d9e6d29828d8abf3c SHA-256: 13bb3fbd5435bec907f0af8b4b5bf8c80a204f6d76c22cc0ff375c3e5f6be289
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as 'Ave maria guitar sheet music' that redirects to a known malicious URL, ttraff.cc. The document also hosts a large number of links to PDFs on Shopify, likely for SEO manipulation to improve search engine ranking for malicious content. The ML classifier 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/wix?keyword=ave+maria+guitar+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4044/8407/files/kasuratatuzujus.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/kezagom.pdf
    • https://cdn.shopify.com/s/files/1/0434/0196/9820/files/39871053502.pdf
    • https://cdn.shopify.com/s/files/1/0431/6879/2733/files/characteristics_of_sociology_as_a_science.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/nidinetawekivorajanekep.pdf
    • https://cdn.shopify.com/s/files/1/0431/5217/9364/files/raxepoduposojagaxibo.pdf
    • https://cdn.shopify.com/s/files/1/0464/5231/0184/files/8_ball_pool_guideline_hack_online_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/ponaruxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2091/0746/files/96571586847.pdf
    • https://static.usrfiles.com/ugd/b8c837_87cbba97ed3043f890761bdf6991f9dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_57315f2387064f5b9116b351a20719dc.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_off00005cfa.bin
d0fa7520fea4a0c370228e6db619c613ab99e2d835a64a4dd6c3a690c6a6ed10
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFA 5232 bytes
font_01_sfnt_off00006ea2.bin
de266b7c50281eb008c60b32c19b93d84d4c05e4eadecc60d632715ecfff9464
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA2 10448 bytes
font_02_sfnt_off000092aa.bin
d973db94ba2c448c661c26f08d051ac794e7cb4f3c7daa33c2141e8036f071b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x92AA 16100 bytes