Malicious PDF — malware analysis report

Static analysis result for SHA-256 c838b91b31a4d8cc…

MALICIOUS

PDF

39.0 KB Created: 2020-08-30 21:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bc343e1afa6036e06338e219b556da8 SHA-1: 3c894be89f296c283b44df5c94f17c24e787bda9 SHA-256: c838b91b31a4d8cc955efebca25fa68d8bcc074ea23fb6458e08bbabd4b8774c
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=omron+blood+pressure+bp785n+manual'. This URL is embedded within the document body, disguised as a manual for an Omron blood pressure monitor. The file also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on 'static.usrfiles.com'. The primary malicious IOC is the redirector URL, which is likely used to lead the user to a malicious site.

Heuristics 3

  • 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.
  • 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.ru/wix?keyword=omron+blood+pressure+bp785n+manual
    • https://static.usrfiles.com/ugd/93971e_a907709c35b84c268c02062349cb3ba3.pdf
    • https://static.usrfiles.com/ugd/b8c837_992ee16689ec42778a78798ee7fe50aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6666bf03ee0493fb4b4ca5e2b13e010.pdf
    • https://static.usrfiles.com/ugd/912de2_fe1d0b6c154840d39ad9412516cb397c.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_d2f58cb8126145748addcdbbbac72e29.pdf
    • https://static.usrfiles.com/ugd/defdb4_67160aa4186b4ef485b126228c2b3736.pdf
    • https://static.usrfiles.com/ugd/6f53d7_57972df9dae249618db19a519c5548ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_43cdedc5c9ef437aaec158e14bc2b1c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_e962df802f1f4e73a24d8e0deb434db3.pdf
    • https://cdn.shopify.com/s/files/1/0432/2453/1101/files/babua_kahela_rota_hai_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9009713252.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3431/files/burial_rites_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/16709051725.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_off000058e9.bin
6a1b8f28ae26f59f28217811e63176635678f5729b8a2740c89cbc0f17247be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58E9 5668 bytes
font_01_sfnt_off00006c0f.bin
74c4e942d1550a9385951479bb450e6f8bd15ab15442988a57f3212c06964e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0F 10516 bytes

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