Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e51b1f71d6f1e03…

MALICIOUS

PDF

38.5 KB Created: 2020-09-04 16:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8db670216e3f7afdde4cbc8fe9e9779 SHA-1: 27ffccc5168d52f589de5e345bfa2e8358b617f4 SHA-256: 5e51b1f71d6f1e033edd8f3d545e5f41ef19cf8a446c0c72864c475bc2554fbc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link, pointing to a URL that appears to be part of a link farm. The document body, though heavily obfuscated, contains the same malicious URL and benign-looking PDF links, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=bosch+dishwasher+training+repair+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_ea5167da5dbf4a818746afe92dda288c.pdf
    • https://static.usrfiles.com/ugd/538d67_207b657a243c4396a2b0bed9ed005c8b.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_99f1736ae9b545ac802fe732193d5abc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b58bd7371b9e4bb192edae163889cf27.pdf
    • https://static.usrfiles.com/ugd/b8c837_529951ec6117469db58261daf5e5997e.pdf
    • https://static.usrfiles.com/ugd/9d869b_943904e8a6f7497fa4db72b6f1aa2392.pdf
    • https://static.usrfiles.com/ugd/ce5d00_fd4f47075d264775b28d7e702ba7156e.pdf
    • https://static.usrfiles.com/ugd/4f92c1_517be274cdeb4ba6a41d6445967e2d73.pdf
    • https://static.usrfiles.com/ugd/23e9be_4fd8afd337434e8a9dccd18c7b74bb28.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2509a62e6f04c63bb67e3b7fb348064.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5165d1bd4e94c2793f58665650ca498.pdf
    • https://cdn.shopify.com/s/files/1/0431/9795/6256/files/pogeka.pdf
    • https://cdn.shopify.com/s/files/1/0437/8587/9713/files/64940827783.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/lofasomutabokudefedexaf.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_off0000596d.bin
d2d8696032758c8fb0a0430a9ba4510f04f251104ee6dfe3127b8c1e6f85b098
pdf-font-stream PDF embedded font (sfnt) at offset 0x596D 5628 bytes
font_01_sfnt_off00006c7c.bin
1bb180066bae4a47922cffc8b720607b45aa26b0bf05e76bfdbcbd2eb3ad51ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7C 9508 bytes