Malicious PDF — malware analysis report

Static analysis result for SHA-256 550a25f53de07ebb…

MALICIOUS

PDF

62.0 KB Created: 2020-08-23 05:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f15417a3087fbea7a775e2264ae270e9 SHA-1: cf56ff187e03374dfe8bb22e6a8dc633485badbf SHA-256: 550a25f53de07ebbb7adce42b33759fefd191196b7d464c42012ddf6e924604b
152 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous Shopify-hosted PDFs, with one primary redirector URL to ttraff.ru. The document body, though heavily obfuscated, contains the text 'Total war warhammer 2 chaos legendary guide' and the malicious redirector URL, suggesting a lure for users interested in gaming content. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of known malicious infrastructure.

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.ru/pify?keyword=total+war+warhammer+2+chaos+legendary+guide
    • http://files.buffalozen.org/uploads/1/3/1/0/131070866/bavusobebifamor-jesinuwalisogu-kemejif-buradatitebaxap.pdf
    • https://cdn.shopify.com/s/files/1/0431/6961/1930/files/fuwasaxozenosadike.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/22137677763.pdf
    • https://cdn.shopify.com/s/files/1/0433/5337/4874/files/21495312755.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4640/files/vinerabinafijexo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/logesuwamirazividereje.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3743/files/ultimate_battlefront_the_clone_wars.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/xowokawusalodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5335/files/ketonesonizi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4575/4792/files/juvagakukiropunu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0722/0635/files/68013659763.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4f8.bin
142d37d6b71a7af4108a0944c0945b875f9eaa4ebf0c2272580e94861672d8c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F8 5628 bytes
font_01_sfnt_off0000c80a.bin
5eb572d72226865560f9b938b0a43eb3b131f961842eb5a0e9b849ac08769745
pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 10472 bytes