Malicious PDF — malware analysis report

Static analysis result for SHA-256 552aa64ce906f874…

MALICIOUS

PDF

72.5 KB Created: 2020-08-30 02:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e949fc125417a69e6d44ce9d04932e8 SHA-1: b2cd99e75f305743ee6b98b63da3ea5125833413 SHA-256: 552aa64ce906f8740282fe3a0918d842b6685fc7e4fb175ce27ab5a6ffc57a18
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious redirector infrastructure. The embedded URL, 'https://ttraff.ru/wix?keyword=stihl+ms250+illustrated+parts+list', is likely intended to deceive the user into clicking it. The PDF also exhibits characteristics of a PDF_SEO_LINK_FARM, with numerous links to external PDFs, suggesting a broader campaign to distribute malicious content.

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=stihl+ms250+illustrated+parts+list
    • https://static.usrfiles.co
    • https://static.usrfiles.com/ugd/0adedf_b10a4ca1de8c402fb159e967a177b659.pdf
    • https://static.usrfiles.com/ugd/834936_d5152e9cc8b8470181d0948943823246.pdf
    • https://static.usrfiles.com/ugd/b8c837_292b33e770de484aaf91ce4a74933f5e.pdf
    • https://static.usrfiles.com/ugd/912de2_8c2a85fbde344bd6b2127d5bd2ec7111.pdf
    • https://static.usrfiles.com/ugd/79cb75_7e2e16da23144f3daaebeccae9f4f6dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f45b8b58a4640e09e609d11f7edfd62.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1fa28cd7f804cd38c43bbb6839a87d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_affb6a93945c4d549595d45de0a7bee3.pdf
    • https://static.usrfiles.com/ugd/e745be_2c1a74fcf8734e94aa8367f6e1541d65.pdf
    • https://static.usrfiles.com/ugd/ade4e6_0278d44b8c4d41aa8e446be4c336b0f8.pdf
    • https://static.usrfiles.com/ugd/ba3095_a647e7c7c15a4da08429b63d94516e08.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_off0000c220.bin
3bbe631c58f3adfcafc28edd9be1be40a29815f1abd35a5fe3f80475597c2bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC220 5368 bytes
font_01_sfnt_off0000d44a.bin
2021da8d4416dba7f3c8fb0e2db00b55718ae8b866e02f379e6b0b708f18501b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 16332 bytes
font_02_sfnt_off000104fb.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 4324 bytes

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