Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7d33e65f241f3b…

MALICIOUS

PDF

46.2 KB Created: 2020-08-16 01:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b551fe4a6f3f3f59e80aab0ad63b4c3d SHA-1: b6b8b4f744c669093d334c690c1f17fcf9f0a80f SHA-256: df7d33e65f241f3b93ba653d5363929a3633f8d720ef69f94f39050c56077b3d
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body text, though partially corrupted, includes the URL 'https://ttraff.cc/wb?keyword=isomerism%20pdf%20download', suggesting a lure for users searching for 'isomerism pdf download'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a potential SEO link farm or a method to obscure the final malicious destination. No scripts were extracted, but the primary attack vector is the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/wb?keyword=isomerism%20pdf%20download
    • http://sakolugi.draff.net/uploads/1/3/1/3/131379326/woripupefuzirufifeg.pdf
    • http://files.onefive8.com/uploads/1/3/1/4/131407918/3364900.pdf
    • http://files.ashleyklemmbirthservices.com/uploads/1/3/1/3/131381109/7568643.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/5672687772.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/gebokeboregomabitikebobep.pdf
    • https://cdn.shopify.com/s/files/1/0440/8305/2696/files/kejijopaxeboronev.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/beyond_biocentrism_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/2132/6742/files/89093456711.pdf
    • https://cdn.shopify.com/s/files/1/0429/2201/6934/files/69089467447.pdf
    • https://cdn.shopify.com/s/files/1/0441/4432/8856/files/canteen_automation_system_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/6651/3818/files/jivasijak.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_off00007919.bin
dca13e60ca7b46fd624d4a50fad66c719fe4ef06c831358e1934f09a2753392d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7919 5216 bytes
font_01_sfnt_off00008ac9.bin
4d1b4bf0bc68af2c0230cc766bfc50077eb1adae3a58c05ebdbc3d94fb2dfddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC9 9812 bytes

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