Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b19d2ee4f846304…

MALICIOUS

PDF

63.2 KB Created: 2020-08-29 16:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d921cb7e7f507814932af0f2fc39a01 SHA-1: 8602b638293735521003a3b191c55fbbf1077516 SHA-256: 4b19d2ee4f846304e2116ecb72678221da48eb158cd1b7e5b2ac945559002ca1
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains heuristics indicating it's a malicious redirector and part of a link farm, designed to lure users with fake invoice or pay stub content. The primary malicious URL, https://ttraff.ru/wix?keyword=fillable+canadian+pay+stub+free+exce, is directly linked to this lure. The document body, though heavily obfuscated, contains fragments suggesting the same lure. The presence of numerous links to static.usrfiles.com, even if some are benign, contributes to the SEO spam aspect.

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=fillable+canadian+pay+stub+free+exce
    • https://static.usrfiles.com/ugd/6924eb_2a506997d1ed48b089ecc75891866b3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b93bcd57c61e4d7ba3303213c9af9678.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec8fa0036ef7465ea804f506bcd2eca4.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf52e3c9035c4fc5ba97cdc78f330aad.pdf
    • https://static.usrfiles.com/ugd/89064d_926a86ece74944508dbeb5305a6f9e84.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9540df9056c4ca2ac0d3107eba11de8.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c5843244585441aace1f5716ae599b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d762bab8e367463a80d8b9eff268446d.pdf
    • https://static.usrfiles.com/ugd/b8c837_281e734dd9934f03bbd40e4afd39e7fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6b09d0ef47d445bb7a58f12c76a5975.pdf
    • https://static.usrfiles.com/ugd/b8c837_626a42b00ac241278c55a1596d4feacd.pdf
    • https://static.usrfiles.com/ugd/5de1df_4428500728af42f9b942601df29a2375.pdf
    • https://static.usrfiles.com/ugd/b8c837_1162317c14554f669c70318841d2fa1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca5af8255dab4f77b418bf4e95e8d011.pdf
    • https://static.usrfiles.com/ugd/b7082a_85c0c0a74a5c497b9bc84f7cbb1c85bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_45f32cf3ec2948f5b6d9871cdedec016.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_off0000aecc.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAECC 2828 bytes
font_01_sfnt_off0000b8c6.bin
76267398aa37025b72dee6ab374f4deae8d0b7c6de5caa5daa3596b9969ff491		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C6 5412 bytes
font_02_sfnt_off0000cb3e.bin
f869c246865196e5108d851261274c55e52b3ef410d4ccbc1213febcfdedc842		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 9828 bytes

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