Malicious PDF — malware analysis report

Static analysis result for SHA-256 e176217b94b21c70…

MALICIOUS

PDF

40.2 KB Created: 2020-08-30 15:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2e04f043a0eecdebb3bd115dc9c686d SHA-1: e3efcb45d156c1f5e7b6ec490872205c741907c6 SHA-256: e176217b94b21c70a59d692b6f9993f4bc11e85bfd96b911e4b9c9351e16f51f
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=descargar+gratis+atlas+ti+6+en+espa%25C3%25B1ol'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on 'static.usrfiles.com'. The document body, though partially corrupted, contains text related to downloading software, reinforcing the lure. The primary malicious IOC is the redirector URL, which likely serves as the initial entry point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/wix?keyword=descargar+gratis+atlas+ti+6+en+espa%25C3%25B1ol
    • https://static.usrfiles.com/ugd/e6092c_a0a81958e57e4cb5b66bba24eeacb807.pdf
    • https://static.usrfiles.com/ugd/913720_ede7477d36c84c81a6b7611968005bcc.pdf
    • https://static.usrfiles.com/ugd/de3d83_57d6865863af4e0291202716db9fc5f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_70ecd7a810a944bd9e73a6ad259d29e1.pdf
    • https://static.usrfiles.com/ugd/ddb60a_5384c25f28114b15b4162607164c85dd.pdf
    • https://static.usrfiles.com/ugd/136d07_66de4a432d5c4d8087855bd5722358b7.pdf
    • https://static.usrfiles.com/ugd/96768c_618cf5530bbe4594a3bfd0940ac524f8.pdf
    • https://static.usrfiles.com/ugd/efb3f0_db078305ec86447c84ffad97d155894b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4dd1d581fa7e47719c9a1f79b245599e.pdf
    • https://static.usrfiles.com/ugd/a18aa6_0081dbad84f34a1482cb21c401d3ff7d.pdf
    • https://static.usrfiles.com/ugd/77d535_9400ff985e3c452bbaf6a6b9ab611f1c.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_off000059f4.bin
82323c80142f842ff5bc686bd65377a4af924cd333461ecef443b0be4da36820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59F4 5464 bytes
font_01_sfnt_off00006c53.bin
2eb0dcc47331e3e032039af14cc4e0bd8f31eb3861974a42d7f8ed56536f81ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C53 11940 bytes

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