Malicious PDF — malware analysis report

Static analysis result for SHA-256 73872bda4a7b5051…

MALICIOUS

PDF

40.7 KB Created: 2020-09-04 00:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c83ae8d2d52607b9614112b386d5b8f9 SHA-1: 5eec6a0be911856bb995ed5a6ca60d8bf05dc41a SHA-256: 73872bda4a7b50513101060a1a629998fc4912a266518a1091d799b7cb20dd44
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of multiple external PDF links suggests a link farm or redirection tactic, likely to host a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wix?keyword=gmit+business+information+systems+level+8
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/cac9e4_eec1f43a75ca44a4969b24b7b519a7c6.pdf
    • https://static.usrfiles.com/ugd/76aeb6_dbbf71ea186a4d1b8b2e119e9c4f4b2b.pdf
    • https://static.usrfiles.com/ugd/5e8de6_1a0eb6a731904174afc456168e25cce2.pdf
    • https://static.usrfiles.com/ugd/b58d21_2f53467805454626bdd82c555d54fd83.pdf
    • https://static.usrfiles.com/ugd/278743_b95858b51a5143b6b02ac2d313af8509.pdf
    • https://static.usrfiles.com/ugd/b8c837_290bc459e8dc47b8aea4d3692838abe0.pdf
    • https://static.usrfiles.com/ugd/63d3ad_008a816acb0e41b0803d437141ba3ddf.pdf
    • https://static.usrfiles.com/ugd/e02969_8f4cb0ff449848a8a8296bd926f496d9.pdf
    • https://static.usrfiles.com/ugd/fe0276_137622f1a69240b196c4390b730628dd.pdf
    • https://static.usrfiles.com/ugd/834936_e7141f46679f4dbb9c5eed84159eb71d.pdf
    • https://static.usrfiles.com/ugd/9c66ff_a385b8224e9f42ae92e9d30b7f550f8d.pdf
    • https://static.usrfiles.com/ugd/7d21c0_4b79afcdc921490b8a844ef2dc19a59c.pdf
    • https://static.usrfiles.com/ugd/ee4d88_493ad06356634812a58c42052d276f91.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c90b5d5b093420bb5424da4e9ecb507.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006130.bin
a97923f6f121ce43cf8fa37b5e0673e8d9d7576e509dadbd06db204272b7e03a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6130 5440 bytes
font_01_sfnt_off000073a3.bin
0b58d25b1819c9ed478f9212e0fa4ac0ec3b03651a18d08ec1f7784cd5029b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A3 10116 bytes

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