Malicious PDF — malware analysis report

Static analysis result for SHA-256 490067a4fd8f6eee…

MALICIOUS

PDF

39.5 KB Created: 2020-08-29 12:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1832f053db06edde2cd2e2207fe5e332 SHA-1: d78bd0629178b3a16f290f24d6c8ed8e8f8b0c6f SHA-256: 490067a4fd8f6eeeb3158b0486a957e88500887896994609721eb9c80b24111e
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a link farm infrastructure (ttraff.com) that is known to host malicious redirectors. The document body itself contains the string 'https://ttraff.com/wix?keyword=she+kills+monsters+script', indicating a deliberate attempt to lure users through this redirector. 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=she+kills+monsters+script
    • https://static.usrfiles.com/ugd/b8c837_0e7da20e86824647ba13f40551d8f149.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0018bb3149a436194e978a19552e0c3.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_90f1fd03b7534347a2201a06b3cabb1f.pdf
    • https://cdn.shopify.com/s/files/1/0433/0396/0731/files/system_mechanic_15._5_activation_key.pdf
    • https://cdn.shopify.com/s/files/1/0434/0079/0170/files/siroku.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/depegavukukewe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8443/2038/files/37785174594.pdf
    • https://cdn.shopify.com/s/files/1/0430/0062/7363/files/78837592183.pdf
    • https://cdn.shopify.com/s/files/1/0447/9506/8565/files/czciowe_tumaczenie_zda_angielski.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cf90db3805747c491e9955418c73c9f.pdf
    • https://static.usrfiles.com/ugd/32acb1_fe53de62429844f2a860712ac2b21603.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e013ddffe1141b6ae4e7d874a777881.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_off00005dd9.bin
4a135ddc18dbd71d60029c8769ac4fe86ba69a580d443b002c2bbaae779eaa31
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD9 5132 bytes
font_01_sfnt_off00006f26.bin
37e8005828bbb14e947578727801d2ea738d7458b1ea8bc32d555286c9e4ab80
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F26 10412 bytes