Malicious PDF — malware analysis report

Static analysis result for SHA-256 c929b3b6be421c37…

MALICIOUS

PDF

40.2 KB Created: 2020-08-30 08:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d94b781a69eb9d4ac3b8ab3160ea7cf5 SHA-1: c8f5eee4da159f1a5260883ba866b50a513afd60 SHA-256: c929b3b6be421c37d5d776a9a8bcad054ea4dec0aaca81eb3460e941735188db
152 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 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of a large number of external PDF links, many hosted on 'static.usrfiles.com', indicates a link farm strategy, likely for SEO poisoning or to obscure the final malicious destination. The ML classifier also 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.com/wix?keyword=amor+del+bueno+descargar+gratis
    • https://static.usrfiles.com/ugd/b8c837_c6c43a1de9d949f5ad10a1b366588b14.pdf
    • https://static.usrfiles.com/ugd/b8c837_869ac493c09145dba22f0521491ed8c5.pdf
    • https://static.usrfiles.com/ugd/3cb679_2dc3d6d5f41e4d19a98596ac74de51da.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fad1ec8506d492aa393b8ba15f0c18a.pdf
    • https://static.usrfiles.com/ugd/57c819_cd4402799e784f0b8f157ff44ca7ce38.pdf
    • https://static.usrfiles.com/ugd/b8c837_011cb1c16cc1455e9a0c6e68e1e63d31.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5b1d4ade9bb4405915c7c4c70ea93ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b8d0798de2a4789a4b0b27ac73622b5.pdf
    • https://static.usrfiles.com/ugd/b65acf_018a83c7119141b790f76ee78f1b121a.pdf
    • https://static.usrfiles.com/ugd/ce77c6_5788b85f5ff7440aaf1f1ae32b19d7cf.pdf
    • https://static.usrfiles.com/ugd/b7ed05_02b2019c50db42799a40de13f2a16645.pdf
    • https://static.usrfiles.com/ugd/b4a829_9db135299bc340ee975501f4663fd551.pdf
    • https://static.usrfiles.com/ugd/3b47cb_4323a3bfe26d43c18c44e1ebf1ef2513.pdf
    • https://static.usrfiles.com/ugd/33a2e4_eaca26b703ad40ed8daaf879390ffdce.pdf
    • https://static.usrfiles.com/ugd/dc98cc_24571604b2964a33a7464fea3c26b26b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e25.bin
851eef7e2c620c23052cf2d6f97c6cc681de6a9cfa3c99482717a21510ffe49b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E25 4164 bytes
font_01_sfnt_off00005ca4.bin
9244ec8a770595288fe2fd9e4d19cc04a75022d88b788726b6e8ff9817970042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA4 5388 bytes
font_02_sfnt_off00006ed9.bin
fc62cfc26ae1086a5dd9484f90b1c32bd9da8b258ceda4fa31daec867714d989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED9 11380 bytes

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