Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd760ac369dee0ad…

MALICIOUS

PDF

39.7 KB Created: 2020-08-30 11:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc695705ffb200e30f1f3eb710120765 SHA-1: 2d57169ff040e064b22eb39891ed873f58abc8a2 SHA-256: fd760ac369dee0ad003af9750d124e7663de87d32254a86754acc673242dff20
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF SEO link farm, with numerous embedded URLs. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.me/wix?keyword=%25D1%2583%25D1%2587%25D0%25B5%25D0%25B1%25D0%25BD%25D0%25B8%25D0%25BA+%25D0%25BF%25D0%25BE+%25D0%25BB%25D0%25B8%25D1%2582%25D0%25B5%25D1%2580%25D0%25B0%25D1%2582%25D1%2583%25D1%2580%25D0%25B5+5+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581%25D1%2581+1+%25D1%2587%25D0%25B0%25D1%2581%25D1%2582
    • https://static.usrfiles.com/ugd/b8c837_41d13a3249a24646b06d8eedd46bd597.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee278d4c0ec341bb9db7c95ae722fed1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a204aadcb32040fea2a3631dabc818db.pdf
    • https://static.usrfiles.com/ugd/b8c837_596eac91c3754e41a552bd17dde78c53.pdf
    • https://static.usrfiles.com/ugd/0c41e7_df0e55ef1d3a4905b13a8e46d32db6cf.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9488/files/engineering_economy_15th_edition_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/58449614358.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/gijakuragodijekaj.pdf
    • https://static.usrfiles.com/ugd/b8c837_d805f603b56b41acabbe7c2be36b2928.pdf
    • https://static.usrfiles.com/ugd/7baf93_f4fd6d8e0c1a486bbe81040469b8daa6.pdf
    • https://static.usrfiles.com/ugd/80c1db_5138b2897687434f881d4d207df69254.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0614adc855f4867a65f5f7e76bb8fdc.pdf
    • https://static.usrfiles.com/ugd/02beb7_aa5d62729e6041578876101553d1c13d.pdf
    • https://static.usrfiles.com/ugd/f65518_a7f7916896fc45bcbacd38f528efcd3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f757f43f1b9348f0a2e983e75a6fd8ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a37ec38b1a34ec982127b418537f6c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_edb856a9c6ec4f37b96d4757c6fd5147.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_off00004fd5.bin
2eae064141e83d70dc7424712f25fd10928fe9f0d47cb6cca8c9b3e0564f7595		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD5 5804 bytes
font_01_sfnt_off00006327.bin
7bf9b30335cb22bffbc8d4ee84a1e1b3521acc06947329229456a7a56ad6ff4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6327 13876 bytes

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