Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84cac81e9ec88fa…

MALICIOUS

PDF

116.5 KB Created: 2020-08-18 19:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 218431846321a91c4e2833d560d1a876 SHA-1: 50025b5db1bbdf4d9fa75b2026371e8a95cd1933 SHA-256: d84cac81e9ec88fa19932055a745d8dee90b000b38c61579f630541de91bed5f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it features a PDF link farm with numerous external links, including one hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=pglo+bacterial+transformation+kit+manual
    • http://files.filmlovables.com/uploads/1/3/0/7/130738614/zopekukawefamad.pdf
    • http://lujero.style-shine.com/uploads/1/3/1/1/131164250/tinelivoruborofel.pdf
    • https://cdn.shopify.com/s/files/1/0429/9449/9743/files/infosys_aptitude_questions_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1657/6424/files/guxevopugesojisabepoxowu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/tovefo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/bloody_roar_game_for_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/86534211752.pdf
    • https://cdn.shopify.com/s/files/1/0437/3990/6197/files/amy_rose_vore.pdf
    • https://cdn.shopify.com/s/files/1/0449/5550/0712/files/oscar_wilde_novels.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/41845603398.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_off00017c30.bin
e95beef9c69a44ecd51c9bfd0abf819f2ed6db98253c0c77ed0f7791bc0e3f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C30 5408 bytes
font_01_sfnt_off00018e7f.bin
ade44b9efb48347bafb01ff688682dd5b4ad440a2e21ffda4c80dcef9df21e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18E7F 17748 bytes

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