Malicious PDF — malware analysis report

Static analysis result for SHA-256 255b5e8ad84d0344…

MALICIOUS

PDF

56.0 KB Created: 2020-09-01 05:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65139f49730cb357906bb79bc20b9127 SHA-1: 65966f07171d7daf93d8a2b2737af5b530a5085f SHA-256: 255b5e8ad84d0344b230eb6bfadf3189723c1bedba8223af2746e3ffb585db5d
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/pify?keyword=brightest+day+comic'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The document also contains a large number of embedded links, suggesting a link farm or SEO poisoning attempt, with 'https://static.usrfiles.com/ugd/07625c_5bff4928b6134d64a16f5c990e13456b.pdf' being the first identified URL in this context. The document body, though heavily obfuscated, contains the same redirector URL.

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.me/pify?keyword=brightest+day+comic
    • https://static.usrfiles.com/ugd/07625c_5bff4928b6134d64a16f5c990e13456b.pdf
    • https://static.usrfiles.com/ugd/f8de3e_2bf90e30858e45989c78dd1ba6f867de.pdf
    • https://static.usrfiles.com/ugd/c618e9_7cb718f29bbb4b35bc1a605739e77fcc.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/91827481430.pdf
    • https://cdn.shopify.com/s/files/1/0434/8031/8118/files/zusezovawupagoxuzefokolod.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6812/files/adobe_illustrato_cs2.pdf
    • https://static.usrfiles.com/ugd/e1c37d_007c29eeaf2e4faca57c98eb9e1515a9.pdf
    • https://static.usrfiles.com/ugd/2274a7_2382403ea75147b6b30d425a687c7b8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c156cb0b3be843ce97a3e570bb728c2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1ccccb3e0484a8fbc947a367d1542cd.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/a_flowering_tree_ak_ramanujan.pdf
    • https://cdn.shopify.com/s/files/1/0436/8472/4889/files/89257589538.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/61546418151.pdf
    • https://cdn.shopify.com/s/files/1/0434/0937/5397/files/battlefield_v_mobile_apk.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/
    • https://static.usrfiles.com

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009172.bin
8f6617fe19021f11ae61b74e58fc382ac7f706a2a6ca968ebcef978224133993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9172 5472 bytes
font_01_sfnt_off0000a3f1.bin
2602b5abf589ce8e2a382a3905a95c2b1a4865d41aae619356d90252458abdc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3F1 15108 bytes

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