Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7f2406ce40a042…

MALICIOUS

PDF

62.7 KB Created: 2020-08-31 05:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5528abc518d1d42d65e8ecae305adae3 SHA-1: c08ae05e212329096d4198723ef3c441aaeb4d97 SHA-256: 5d7f2406ce40a042d23e08b89c6511aabc517a88f27ba1a0f461a58cad491679
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass external link farm, with one primary URL identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to the redirector URL and other benign-looking PDF links, suggesting a lure to external content. The ML classifier strongly indicated maliciousness, supporting the interpretation of a phishing or redirection attempt.

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.com/wix?keyword=bts+reacci%25C3%25B3n+a+ti+dando+un+beso+su+c
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/gobaxalipofowomito.pdf
    • https://cdn.shopify.com/s/files/1/0436/3019/8937/files/rexemokizulapevularewenuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6240/files/81231774295.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0cc46f18ff542b3bfe17710fee3003e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c05f146b81c2431ca25b7161eda455d1.pdf
    • https://static.usrfiles.com/ugd/105a8c_ab1f2d57f50347d58b891653a08bb424.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b1d0a83b5f24a71985914db063d5bbf.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_ce3540ee7280473892f79ec212604345.pdf
    • https://static.usrfiles.com/ugd/704566_3d31d7ed01d0410b91451e5f2f6d9ebc.pdf
    • https://static.usrfiles.com/ugd/0c41e7_d9c3bcb518a74d2e81caa8bc9f91be9d.pdf
    • https://static.usrfiles.com/ugd/97aff7_17180b25ee13421ca834bf5ee1860503.pdf
    • https://static.usrfiles.com/ugd/b52961_9bea72ca0d6f4c708f32601ea0057bfe.pdf
    • https://static.usrfiles.com/ugd/bae363_835916acf26849b2bf1fbcf6c4186788.pdf
    • https://static.usrfiles.com/ugd/bf07b1_b15729c054284a5cac976fecf4b8159e.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063a9.bin
9bafed6a8227fcc6df3d285f0351d97f95000bfd8db0bcfde5d0acde3a17fc8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A9 5108 bytes
font_01_sfnt_off000074be.bin
3b92c197d6f4ad804c5529da3e63214ea5f1a5d5a6c12fd6271464f4af6537dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74BE 14084 bytes
font_02_sfnt_off00009d75.bin
6a5977d6616a844efec287dc54f77d2fecb6504da276b32030946c9dc802938b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D75 11580 bytes
font_03_sfnt_off0000c35c.bin
d9ff2f97d8658c0ffb750065b33117140e1ff3ad52f32ed658b49b4b8c06dda4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC35C 17752 bytes
font_04_sfnt_off0000dcc0.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 4324 bytes

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