Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bd31c21ca0b508…

MALICIOUS

PDF

46.9 KB Created: 2020-08-15 22:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ef139c09a3e1012309f27948c01ab84 SHA-1: 91a5bc671a9dae3421a80ac5e7afdffa6ceb0f68 SHA-256: a2bd31c21ca0b508fa79b40366a51d01231498ee240c1720e62b434e3a33786f
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.ru/pify?keyword=arsis+std+regular+free', is flagged as a known malicious redirector. The presence of numerous external links, including those hosted on Shopify, suggests an attempt to manipulate search engine results or to distribute malicious content through a link farm. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a malicious redirection or SEO spamming attack pattern.

Heuristics 3

  • 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 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=arsis+std+regular+free
    • http://files.armiesoftn.org/uploads/1/3/1/4/131454916/vixekoguvezatu-zagitematobusor-gilamud.pdf
    • http://files.cohesionengineering.com/uploads/1/3/0/7/130739974/bavisixalonev.pdf
    • http://files.drewwatsonpups.com/uploads/1/3/1/4/131454791/vufowabuxutafo_tapuzebafujidab_sokeleditunajot.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2905/files/kejaposuxijeju.pdf
    • https://cdn.shopify.com/s/files/1/0436/0096/9896/files/61108176150.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28068876324.pdf
    • https://cdn.shopify.com/s/files/1/0436/1800/9250/files/12363594472.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/petals_in_the_wind.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/7367500328.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/vegetable_lasagna_butternut_squash_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/0124/0992/files/exemplars_of_evil_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/sixavojuvejudazusafag.pdf
    • https://cdn.shopify.com/s/files/1/0431/3445/1874/files/43356501078.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_off0000569c.bin
8c3e232661ee9718c6e7ab18858fc72549200aef81170d289a91e6550214f8fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x569C 5064 bytes
font_01_sfnt_off000067df.bin
76eeaf41bf0ca2bd01698aaf6aaf4a0b0c3384bbfc45d8e6d44b6c895c281e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DF 15876 bytes
font_02_sfnt_off00009a05.bin
e5245523bd71a78e06ca3300da63f55ad096e28dd8c1a5e83e138be64f7d0aee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A05 16084 bytes

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