Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c361001aad2d7fb…

MALICIOUS

PDF

38.5 KB Created: 2020-08-31 11:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03c269eac337d888c251aa3a28d9edb4 SHA-1: 8c42792254fd1e7bdaaab733ff420593400facd2 SHA-256: 7c361001aad2d7fb863faad5188175ad0f2c14cfe3663eebc2ca73fff18f0646
158 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a critical heuristic firing indicates a malicious redirector link. The primary malicious URL, 'https://ttraff.ru/wix?keyword=yoh+yoshinari+art', is likely intended to lead the user to a phishing or malware distribution site. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.ru/wix?keyword=yoh+yoshinari+art
    • https://cdn.shopify.com/s/files/1/0431/7177/4615/files/5843774350.pdf
    • https://cdn.shopify.com/s/files/1/0434/0937/5397/files/wound_infection_prevention_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/mebanuzikegemovoxigi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/92890540859.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/vusonexalewabebavupine.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/jaxikaluxidomev.pdf
    • https://cdn.shopify.com/s/files/1/0435/8157/1227/files/7101827454.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/3085918910.pdf
    • https://cdn.shopify.com/s/files/1/0428/2230/3900/files/batman_vs_superman_movie_in_tamilrockers._li.pdf
    • https://static.usrfiles.com/ugd/b8c837_424d2e06a9b944198bb36cef0e58beaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_96fc0f23e4144a17826ac6aca3cbee9b.pdf
    • https://static.usrfiles.com/ugd/a640e9_6f32be090ce3401f8c0db4d2849982e0.pdf
    • https://static.usrfiles.com/ugd/99965f_9878bb3cfd28452db9fc79d5b1ba53ee.pdf
    • https://static.usrfiles.com/ugd/c836c3_1c26b66eed0e4f4a8ce360daad2512ba.pdf
    • https://static.usrfiles.com/ugd/01e791_916eb6d4557a4cfa88124d6e9df284a2.pdf
    • https://static.usrfiles.com/ugd/857e61_49c132e533c94be1afa1f99d5179494c.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_off00004c4c.bin
08110a215f1acd41d6cf1e588845dc4ecf0cd83c35a862fb394dccb013d816d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C4C 3568 bytes
font_01_sfnt_off000058f3.bin
e84f60f60645c6a68c6169c1e3aa694cbcfe989c8f1c4b9b788a12c311c06490
pdf-font-stream PDF embedded font (sfnt) at offset 0x58F3 4804 bytes
font_02_sfnt_off00006942.bin
884c7c8e37f168d2977fb9f2f57a04957ac312a2916ddddccfd3f08ab6eeb2f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6942 10016 bytes