Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6b925c533218c0…

MALICIOUS

PDF

39.6 KB Created: 2020-08-29 14:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b57ed3a98500df340550ec11e3cc5165 SHA-1: e4a2bc3ba28c47ca9be2aee5d224bc3933790c19 SHA-256: bf6b925c533218c01c9b093e8af803b243bf251df24a54c4b7efa5675c7a9bfd
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used to create SEO spam or to redirect users to malicious sites. One of the primary URLs, 'https://ttraff.cc/wix?keyword=grammar+videos+third+conditional+%25E2%2580%2593+exercises', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, reinforcing the link farm heuristic. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=grammar+videos+third+conditional+%25E2%2580%2593+exercises
    • https://static.usrfiles.com/ugd/b8c837_e21ebc83e53545c0992db7a8490f7f50.pdf
    • https://static.usrfiles.com/ugd/b8c837_a33d3cda790a4d43ba951291a5ab1ebf.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5333afdbc4d48c2979e4d8585a24a4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb978c7614344c0fbfc7e0f353724bc2.pdf
    • https://cdn.shopify.com/s/files/1/0434/5466/0758/files/40959411072.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b6596033ebe41459a3f3a90c3985e06.pdf
    • https://static.usrfiles.com/ugd/b8c837_a41edc31688c40e2b1253604609abc88.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa1d48ee2241479585c769cc68060bd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_72dca2aab43849c2831309232ee23de5.pdf
    • https://static.usrfiles.com/ugd/b8c837_bec52d215bef415bab6634e77357ab05.pdf
    • https://cdn.shopify.com/s/files/1/0432/6545/8336/files/ap_grama_sachivalayam_merit_list_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/5194/0000/files/8747637224.pdf
    • https://cdn.shopify.com/s/files/1/0431/6158/3776/files/pronunciation_games.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_off00005a33.bin
5fcfe0809bfde605a5666e296eb69c3c73da7eb184c14097df162445762a77d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A33 5368 bytes
font_01_sfnt_off00006c60.bin
5fd5346246c5108bad7f44599e4f673144c76dcba1c14c1299ab884d0b9d6e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C60 10620 bytes

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