Malicious PDF — malware analysis report

Static analysis result for SHA-256 229ad537b84f93c4…

MALICIOUS

PDF

61.6 KB Created: 2020-09-17 06:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c3a25b3f6f53f622065484a402b7f5 SHA-1: d6f7be460051eb5eeec088ff0812f25400b588ba SHA-256: 229ad537b84f93c4647380248b0bd9cbcab4233ee59d89510df57af9fc019c72
152 Risk Score

Malware Insights

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

The PDF file 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 link farm, with numerous embedded URLs. The primary malicious URL identified is https://ttraff.club/pify?keyword=giao+phan+kontum+2018, which is likely used to funnel victims 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.club/pify?keyword=giao+phan+kontum+2018
    • https://40146508-1a90-4418-831a-bcd961408659.filesusr.com/ugd/6cf392_5d92f7001fef4e8fa8958a016afc9d4d.pdf?index=true
    • https://47c2cab1-c767-4e56-b0c1-52386674475e.filesusr.com/ugd/d4da64_31742d6c683943e2988738bc7dfff107.pdf?index=true
    • https://a9f972ef-3b5f-42a0-9846-15b9f3b1fc99.filesusr.com/ugd/6290de_9a0536b9a4b84f40aa53cca0cc49e0eb.pdf?index=true
    • https://311174de-086f-4c37-9cc3-bd7a02461a9f.filesusr.com/ugd/29c71c_fae2d20c720e43739131d98e43539ee9.pdf?index=true
    • https://c58d2b35-938d-4561-9adb-8a4ddc55f331.filesusr.com/ugd/f3bfbb_0075c9f5e3ea4cdd873e7317b049668e.pdf?index=true
    • https://379f8986-62db-46ca-b373-a5d95778c10a.filesusr.com/ugd/a4ea6c_39c701caafb84ff29c59c83e13e86ad2.pdf?index=true
    • https://15d7d049-9719-4076-ab13-96f84f7ceb06.filesusr.com/ugd/3402b1_7b960b7f17ea43ad936ca85ddb38aae6.pdf?index=true
    • https://708449ac-65a3-4e34-9ec5-acc9ecd08918.filesusr.com/ugd/1c8c1e_1489c482a552406abf84cfc171376ffc.pdf?index=true
    • https://2d02ed42-ae41-49b4-b929-5ec5419093c8.filesusr.com/ugd/625844_81732aa02fc4462d9d33982ea2bfbab3.pdf?index=true
    • https://3fde68af-c967-495a-a619-dd75c8f2b58c.filesusr.com/ugd/3ed902_29d83739535f48be849796ac46c87bc0.pdf?index=true
    • https://ad53debe-e97b-4466-8c19-adc40b655cbd.filesusr.com/ugd/3e7897_ebed734a29f348e09e98386dac68689a.pdf?index=true
    • https://1e82a57c-1692-490b-9078-7a7270272a92.filesusr.com/ugd/d7d6cd_57cd1876b48e4500939c462f01d9bd97.pdf?index=true
    • 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_off0000b3c7.bin
dc8ce7dc9fa64122c7858729fc40e8a86e30578ccacdd2932f48fbe2d18ccda5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C7 5368 bytes
font_01_sfnt_off0000c5ef.bin
0787ad90fc91942f10f7afd23ffaf7c6287cda6bca8b83fd3751766fcc05cc6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EF 10560 bytes

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