Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7809bb6d452b6a…

MALICIOUS

PDF

55.8 KB Created: 2020-08-14 16:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7fea3ed273e60d215c25c0469c5e31b SHA-1: 380a9265a41cd6d99dd3eae3a5ac0f45bf162cc3 SHA-256: cb7809bb6d452b6a34be64c7e516645f24527d39eb9008eaf65590374fc0ca28
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link redirects to known malicious infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains the text 'Ophthalmology journal author information' and the malicious URL, suggesting a lure to trick users into downloading further content. The presence of a visual download button heuristic further supports this phishing attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ophthalmology+journal+author+information
    • http://moxefiz.daigribbleangling.com/uploads/1/3/1/4/131413718/77c8c9fc18ebe4a.pdf
    • http://files.thoughtsfromthepaint.com/uploads/1/3/2/6/132682076/8225074.pdf
    • https://cdn.shopify.com/s/files/1/0438/2100/7005/files/jurnal_atavisme.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/rezagaxunizifil.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0690/files/14521764683.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/bach_christmas_oratorio.pdf
    • https://cdn.shopify.com/s/files/1/0428/5943/0054/files/sindh_textbook_board_jamshoro_english_book_9th_class_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/wolifomomudawaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.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_off00009d21.bin
3a78a1c59f6c55806bc6b3a153ea8d512dbbd36a21ceba424c02ccf56e5d0118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D21 5344 bytes
font_01_sfnt_off0000af3c.bin
52d6801e52faad1b76e17938cfdc27a3147a69297458db355e3d879ca7fdb4ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3C 10376 bytes

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