Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bdfd8519f30188…

MALICIOUS

PDF

33.8 KB Created: 2020-08-31 09:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ce1c8a5a3da686aef8b1de1e2a3020d SHA-1: d2660c198a045d67dbfb652141d937b84bb54716 SHA-256: a8bdfd8519f301882e7495c3c913b4258e28116bbdcae72ea2c20ae8d90c59ef
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Ll bean touch thermometer instructions' and a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive document, leading users to a malicious URL.

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.cc/wix?keyword=ll+bean+touch+thermometer+instructions
    • https://static.usrfiles.com/ugd/b8c837_132628c7ef364e36a9117a681bf6acdf.pdf
    • https://static.usrfiles.com/ugd/9ea91e_63d7ace1aec442a0a5e1221324d123cf.pdf
    • https://static.usrfiles.com/ugd/49be48_9c4044afbf784e8a9477ca050c9e53f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cf5844647b943c3976e123e49d235b6.pdf
    • https://static.usrfiles.com/ugd/60933b_47c82c06538448beb9b4bb26c5386e8c.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_45ff7e0159d94a7b8e4589482db961ae.pdf
    • https://static.usrfiles.com/ugd/e643da_f9afa1168b764c84930fa11cb16e043d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cefc7238c4540a884b66f684e1a503d.pdf
    • https://static.usrfiles.com/ugd/1cc777_9e8f09d2f71f4494b16f297feec31783.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab4b9dd1f4d2481b88e569ff2cff4b1a.pdf
    • https://static.usrfiles.com/ugd/67f5f7_e4fc308a532b4afc86e8df8a3fa7e71a.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_0a308f51cfe64d73ade773a21c0b8f87.pdf
    • https://static.usrfiles.com/ugd/d2751c_9a174c77cb2640a28d2e722b3e90dd0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d20b110532c74c6eb7e66faf85c44d35.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_off00004846.bin
21fd089d72077751c8be4d3100cab3cc0d937ad7c1289a10db8a217244a75cbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x4846 5120 bytes
font_01_sfnt_off00005980.bin
4f100ecbcdd43a3298e28cb9bfb3e43ef9d9f178b8ade005ea182c849b7414da
pdf-font-stream PDF embedded font (sfnt) at offset 0x5980 9640 bytes