Malicious PDF — malware analysis report

Static analysis result for SHA-256 4044d49df415022d…

MALICIOUS

PDF

34.4 KB Created: 2020-09-07 08:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a568f77f8064828fc5969a15550a9ca SHA-1: 1bc3aa0ba7582d4c40b3200a9209312613b88d07 SHA-256: 4044d49df415022d373c4cd7ab98f7ac79df309306b7370e1708ce811ce0199b
120 Risk Score

Malware Insights

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

The PDF file contains a link farm and a malicious redirector URL, disguised as educational material. The primary heuristic indicates a PDF redirector link to 'ttraff.club', which is known malicious infrastructure. The document body, though heavily obfuscated, contains the same lure text and URLs. The presence of numerous links to 'static.usrfiles.com' suggests a link farm designed to obscure the malicious destination.

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.club/wix?keyword=periodic+table+of+elements+worksheet+grade+3
    • https://static.usrfiles.com/ugd/b8c837_5aa1626723664c1a8fe0a8db252ea8ec.pdf
    • https://static.usrfiles.com/ugd/37428b_1ebee9b3cc3a45a58a4e7659b286c0a8.pdf
    • https://static.usrfiles.com/ugd/0e6328_2fbe0786eb3b4aa78ebfb37ceb35e241.pdf
    • https://static.usrfiles.com/ugd/54dfea_5745d6af99e8460e91b3d3ce6172a28e.pdf
    • https://static.usrfiles.com/ugd/3de8a6_17d51df3843c469f97153538a60c6502.pdf
    • https://static.usrfiles.com/ugd/03ae60_3be21cbf8c8e4fdd82fd927e9d2b1410.pdf
    • https://static.usrfiles.com/ugd/a421e3_8354b7de0fc84af5b9168ad31793b773.pdf
    • https://static.usrfiles.com/ugd/f4de5e_a7773d1bb0674dd88ccfb0464f7e3993.pdf
    • https://static.usrfiles.com/ugd/23e9be_045a6d0f2fbc42c988ce1119d3866db8.pdf
    • https://static.usrfiles.com/ugd/e6e573_523f0e8473fa4447b3c60d1ceccbbca1.pdf
    • https://static.usrfiles.com/ugd/5ed537_9e0fddd13ed74014ab696fe86067d3bc.pdf
    • https://static.usrfiles.com/ugd/1be480_4dde95e00e47449f809b0d816218d00a.pdf
    • https://static.usrfiles.com/ugd/e3325f_2cd344c0f6514b6895b42f70c7ea4743.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_off000047a6.bin
ca9c6c64fc60a272165394c5b9aad0e6105bab27c601f133cd12eb1b7b158169		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47A6 5896 bytes
font_01_sfnt_off00005b9d.bin
e3f05ec941d49b435e0c6ee5d610db743a19eeb82f01a1a597b74b532dddc2aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9D 9692 bytes

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