Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b046ab8fa4f5338…

MALICIOUS

PDF

42.4 KB Created: 2020-09-05 10:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34263fd20f4f04bd88f42f06e0a8e279 SHA-1: 76f7f2403d218d90c78738e1a39cfa077d2c0451 SHA-256: 2b046ab8fa4f5338352c401a8f012ae8790f6fb2a019d073b39fdf47f6294e43
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/pify?keyword=who+tb+meningitis+guideline', which is likely intended to redirect the user to a malicious site. The presence of a large number of external PDF links also suggests a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious.

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.me/pify?keyword=who+tb+meningitis+guideline
    • https://static.usrfiles.com/ugd/b90ba1_9d0ec824b49f4655b31047459a12709b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a23b6ba8c2334f3d8b7f48d618d097d6.pdf
    • https://static.usrfiles.com/ugd/384ea4_dc1dc6fedde543c3b49a5ea6ba71e4d6.pdf
    • https://static.usrfiles.com/ugd/6116da_156b3cc1969b4981ae5c7485463c12ba.pdf
    • https://static.usrfiles.com/ugd/69695d_9fa6264749d841ce873608f4e8bd349a.pdf
    • https://static.usrfiles.com/ugd/c33cdb_10dde018bfd0427ca74bc76ca3432bb6.pdf
    • https://static.usrfiles.com/ugd/599026_475ddf20e30d403a8f4427963ad17767.pdf
    • https://static.usrfiles.com/ugd/850f07_634bcf1a74f84048842fec716bc0f937.pdf
    • https://static.usrfiles.com/ugd/3aee12_f030d58e7778471b96108e3b70a69a5b.pdf
    • https://static.usrfiles.com/ugd/df73ab_c90db45d39e14ec18aec818399cb8f87.pdf
    • https://cdn.shopify.com/s/files/1/0439/8333/9678/files/test_de_raven_resultados.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/gamekulemeza.pdf
    • https://cdn.shopify.com/s/files/1/0433/6212/3941/files/lubopumawavatavas.pdf
    • https://cdn.shopify.com/s/files/1/0430/6652/3809/files/24112473935.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_off000067f6.bin
d4d6df5079027cf21d703b4942ca00a637f6e87f563ad66fea7ee389e898f59a
pdf-font-stream PDF embedded font (sfnt) at offset 0x67F6 5084 bytes
font_01_sfnt_off0000792a.bin
e94f40f61b8a69adae21a97eb1dfc51af37350bae04aa6b48807c3f55ae19dc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x792A 10516 bytes