Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fd1c77e5e0bdb5…

MALICIOUS

PDF

66.1 KB Created: 2020-08-29 23:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f72bc31536c5045f4beef07fe60573a SHA-1: f0ce916b1dfd9ccae82b8d24219df59e1e05066a SHA-256: 73fd1c77e5e0bdb5857f016f5faf5a2e033f8cac0959a63f78d727c55fc396f8
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.com/wix?keyword=vendaje+de+abdomen', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to direct users to potentially harmful content. The ML classifier strongly supports the malicious nature of this PDF.

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=vendaje+de+abdomen
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_e0c0ceca269946ed84108e499f627310.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b1b6fdcb2ee450ab16f69ee811afecf.pdf
    • https://static.usrfiles.com/ugd/b8c837_be12df765d8b4334b87b34c75c53f5ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd761afde9dc46d5aa79391bae547ccc.pdf
    • https://static.usrfiles.com/ugd/b8c837_efab7b681d9a43dfa11e5b6b10af5f43.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b368c8b3df04095a262d74210bf78ad.pdf
    • https://static.usrfiles.com/ugd/daca0d_467187cc9e194199a448ad91875f782a.pdf
    • https://static.usrfiles.com/ugd/b11f6d_b9a74eb87d474cde9f60de2f7529656f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fd79bb1f9024c4aa36f6bef30a955dc.pdf
    • https://static.usrfiles.com/ugd/136d07_5c254eccba79451a90b2ec6af14a8006.pdf
    • https://static.usrfiles.com/ugd/b8c837_91d4867ac1f04469b83472b97fd8454e.pdf
    • https://static.usrfiles.com/ugd/bb13a2_d4505b9dcea7481bb5f76f7231ee63ed.pdf
    • https://static.usrfiles.com/ugd/0789d5_f649676cd3f44a8f97675a240836b586.pdf
    • https://static.usrfiles.com/ugd/15cd4d_e3a3292e23a74ad2865d2c208c5bca76.pdf
    • https://static.usrfiles.com/ugd/b8c837_39e6caa1872b43a28dbce8683b806f40.pdf
    • https://static.usrfiles.com/ugd/286fb8_0cd54b3cd2d24d61b760ac4f61e0114a.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b90a.bin
f62c21868fc3dccc8dac130b80d9ca64c34bfb1df8b70fbe41bc5c16c68c5f86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB90A 4504 bytes
font_01_sfnt_off0000c836.bin
ce3d256659a3a0f020196790c432d6cbcfbada5481aa83028d2ed55dd68b89a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 11012 bytes
font_02_sfnt_off0000ebdb.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 4324 bytes

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