Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cf569d1b35a712…

MALICIOUS

PDF

40.5 KB Created: 2020-08-31 19:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7319200633eae28e75a6df4b0ad00590 SHA-1: f039d3fa12971193c300ccc6bfbd3221eeb42521 SHA-256: 44cf569d1b35a712b0ad16b50c7ebe070ebb67842eb6e0e62a556b56a4d1f98b
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=lego+dimensions+guide+book'. This URL is presented within the document body, disguised as a guide book, indicating a social engineering lure. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to static.usrfiles.com, likely to improve search engine ranking for malicious content. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing site or malware download.

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=lego+dimensions+guide+book
    • https://static.usrfiles.com/ugd/3b7182_2e76b6eb5ad64c33a26e9966bfed22a0.pdf
    • https://static.usrfiles.com/ugd/a58b01_9398bfef479044febabf94f481482416.pdf
    • https://static.usrfiles.com/ugd/b8c837_21a4a7185ed449d0845e68ac0c7f72f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfc02f791129431cac1bbd18151410f3.pdf
    • https://static.usrfiles.com/ugd/3b7182_a2d4deb0233c4aa7aa4b82e8f1edee24.pdf
    • https://static.usrfiles.com/ugd/5e8de6_6f6e6fa3661a41589c91775f27f4e641.pdf
    • https://static.usrfiles.com/ugd/e6092c_754aaf138dfb4180bb907241d247ec66.pdf
    • https://static.usrfiles.com/ugd/197ed4_a92919e9bb1b471cab0e3ad4fc5a6393.pdf
    • https://static.usrfiles.com/ugd/b8c837_29761a4f13a847ff9d8959fd0521ee1f.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_23e1c47e559c40aabe95f0b073e4d1f9.pdf
    • https://static.usrfiles.com/ugd/7603ae_0b9221e2045c4f528412aa9bd1599543.pdf
    • https://static.usrfiles.com/ugd/b8c837_455f551428b740809a72f88b29ea7ddc.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_off00006091.bin
ec1634305d2ca7ddc05e8d91c237104111a591785f9e6dee2dd51be5032c71d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6091 4952 bytes
font_01_sfnt_off0000716a.bin
b2fb0614fda5d612fe87b3e2d71c3f3879810ebc3bbd10adab67bbe229b4b0f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716A 10628 bytes

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