Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba934ace5e08e947…

MALICIOUS

PDF

40.5 KB Created: 2020-09-02 04:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6d5481b524a57f17565e0b3288b3ab9 SHA-1: ae9b751a958f33ceebfa3c8579658d7bf97ec584 SHA-256: ba934ace5e08e9473d518bd13a5d09bbbcac0cf9f16d2921123e82bf57651f2a
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, masquerading as study materials. One of the primary links, https://ttraff.ru/wix?keyword=basic+accounting+test+questions+answers, is identified as a malicious redirector. The document's structure and the presence of a large number of outbound links suggest a link farm or redirection scheme designed to lead users to malicious content. No scripts were extracted from this sample.

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.ru/wix?keyword=basic+accounting+test+questions+answers
    • https://static.usrfiles.com/ugd/7f46b5_a60b4609b276407ea889e4ef146497fe.pdf
    • https://static.usrfiles.com/ugd/143c98_b9038a88ba1d43c6918770a0e744df06.pdf
    • https://static.usrfiles.com/ugd/362633_0881520de8cc428b989e9c0dbd8faf2b.pdf
    • https://static.usrfiles.com/ugd/cafc24_6957f391ba0c46f8a69da4911966a595.pdf
    • https://static.usrfiles.com/ugd/89064d_638a58b318d2433b80b90ce34f5a5182.pdf
    • https://static.usrfiles.com/ugd/b8c837_7cda6eb667ad437ca740bd61b864e9b8.pdf
    • https://static.usrfiles.com/ugd/b16523_1723be1f73a5443d8f8ee2a193cf52db.pdf
    • https://static.usrfiles.com/ugd/2f7815_c9bb77e34a76497b875a7e9b2c5a6ae4.pdf
    • https://static.usrfiles.com/ugd/824332_7c551bb6ca9a4db58b27e26886a2c4b7.pdf
    • https://static.usrfiles.com/ugd/de60da_e88d5b94bed6432a988e123cff2494dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cfa656bb47247d894b66cbc9449a514.pdf
    • https://static.usrfiles.com/ugd/1e4819_34b29e52479e492b852dde9d8e455e63.pdf
    • https://static.usrfiles.com/ugd/1df9ea_463bdf82bef04b6d9c2916f14bcf2b39.pdf
    • https://static.usrfiles.com/ugd/eb4c03_16882a23259e45638e4420ecbb1d5e66.pdf
    • https://static.usrfiles.com/ugd/aff7ca_ae0b2d9ab43740dc8ef34968d368b33f.pdf
    • https://static.usrfiles.com/ugd/40336e_8214b3c9599b4351acb4f10c1398e5c8.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_off00005e9a.bin
48c48b1a910eabafb6d2e81c4876315300f7558ffef4dc32ab305ad415e7cd89
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9A 5200 bytes
font_01_sfnt_off0000706e.bin
8263fe8e3dda02a831edf82282aa1f21492b61b819b8bb9901fea8bf31572c5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x706E 10836 bytes