Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cf1ff4a06ff292…

MALICIOUS

PDF

39.3 KB Created: 2020-08-29 19:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa24a4b7e44dc28056fe59d9ae82add5 SHA-1: 609ed0051bf5db4b079da163380240b84a58b35b SHA-256: a9cf1ff4a06ff2922a6576d173a12674cf71104edfa74b0f7f8a9c0f2f8b60a1
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.link, which is presented as an art guide. This indicates a social engineering lure to trick the user into clicking the malicious link. The PDF also contains a large number of external links, many pointing to Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

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.link/wix?keyword=acnl+redd%252527s+art+guide
    • https://static.usrfiles.com/ugd/8b2c09_55c64ba044fe4e8ab1639e7f9eee376a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d05a729c1dd4c169673ba417321a4ac.pdf
    • https://static.usrfiles.com/ugd/253000_6fbcd4b5a5344630be9bb48e0bff51a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d55e308b2b1a4fec92a5a067b4f9e9d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc49fc282ce94bc688b41131689e017e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7807bcadfb849dea0642997cd7616ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4ad87bbb5ac45b1b7a6d1efa8027d16.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/nubimutifudifuvowosumerux.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/photoshop_cs2_keygen_only.pdf
    • https://cdn.shopify.com/s/files/1/0438/7710/5832/files/vibegizixapoke.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/sistema_mexicano_de_equivalentes_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/63086246663.pdf
    • https://cdn.shopify.com/s/files/1/0451/2507/5109/files/cbse_class_12_physics_board_question_paper_2020_solved.pdf
    • https://cdn.shopify.com/s/files/1/0437/4354/3447/files/gonilamatulofuvari.pdf
    • https://cdn.shopify.com/s/files/1/0439/0171/4587/files/rush_hour_2_heaven_on_earth.pdf
    • https://cdn.shopify.com/s/files/1/0434/5289/1298/files/50658194098.pdf
    • https://cdn.shopify.com/s/files/1/0437/6156/5850/files/american_history_test_questions_and_answers.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_off00005d87.bin
0dd7755c41dc050024184a7423478b6249cbd8f8a86343a2c9aeac73142031b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D87 5132 bytes
font_01_sfnt_off00006f02.bin
22e2b9cdd28049968d7b3437b9ed64918b6fe470153b34643e61a8e8f29611e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F02 9816 bytes