Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e874f41fd03345…

MALICIOUS

PDF

40.9 KB Created: 2020-09-01 04:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef9b715f9a30ef27ca5219143c96a803 SHA-1: 34ebfcea57f3eaaca742e4723f00f8bdca998eb9 SHA-256: b9e874f41fd0334595b3e1a7d5d01623728268e03ef33a61366982a11bf6a8f2
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.cc', identified as a malicious redirector. The document body, though partially corrupted, contains text related to a 'video player app free' and the malicious URL, suggesting a social engineering lure. The presence of a large number of external PDF links further indicates a link farm, a common tactic for SEO poisoning or distributing malicious content. 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.cc/wix?keyword=video+player+app++free
    • https://static.usrfiles.com/ugd/0a593f_70b8d1cf9bf64069af18360217d9ac04.pdf
    • https://static.usrfiles.com/ugd/83b1b3_5f29af1a1d8f49eba0e20603f2c20736.pdf
    • https://static.usrfiles.com/ugd/6c032c_989d6ca113cf4815addc151c44660d95.pdf
    • https://static.usrfiles.com/ugd/1a89c8_49fe23b84e2c40cf95335562acc84285.pdf
    • https://cdn.shopify.com/s/files/1/0434/1612/5590/files/zozifepupo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/asciidoc_table_cell_formatting.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/can_t_hurt_me_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/8719/0430/files/vasogojadufavos.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/zudugexigesavudulil.pdf
    • https://cdn.shopify.com/s/files/1/0439/0980/8280/files/del_fusible_mazda_3_2008_interior_lo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4066/7810/files/vegas_pro_shake_effect.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/gupexig.pdf
    • https://static.usrfiles.com/ugd/9421c8_22d2167248b44904a481dc100dc828f0.pdf
    • https://static.usrfiles.com/ugd/3826db_7fe208d38d3444e098b139ed935deced.pdf
    • https://static.usrfiles.com/ugd/b8c837_e10cf23a635e4b4bbe16af9fd3b43a9d.pdf
    • https://static.usrfiles.com/ugd/8b49c6_094c9b1918b14db1a8150fd590507afa.pdf
    • https://static.usrfiles.com/ugd/ae15ca_ee43a4d0c227472fa4a50b21678e369f.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_off0000629a.bin
6a579e9819988f9d7e4398b6b2050d081730898f6f69c5b089a77b15b7a4e5b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629A 4924 bytes
font_01_sfnt_off00007378.bin
e4934d7a03a87083d08617b3d282ae22eb6843101edf7a219bd736fd0fc82f29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7378 10252 bytes

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