Malicious PDF — malware analysis report

Static analysis result for SHA-256 f543091aef2aa875…

MALICIOUS

PDF

46.8 KB Created: 2020-08-14 20:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b6312fd2f4f4b6303e42339014cee1a SHA-1: 2a6189a6bfdfa87500788e3eebf082e5d9994138 SHA-256: f543091aef2aa875e199723dee406b3a9db0dc07be1a20615e8b5fd1d1412339
128 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'printable promissory note form free' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious content. The primary malicious URL is ttraff.cc, which redirects to a page related to promissory notes.

Heuristics 4

  • 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.
  • 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.cc/pify?keyword=printable+promissory+note+form+free
    • http://gilanor.givoie.com/uploads/1/3/1/1/131164250/8644611.pdf
    • http://files.villanovancaastudentchallenge.com/uploads/1/3/1/8/131871659/2801796.pdf
    • http://files.uwflagler.org/uploads/1/3/1/0/131070604/libavixokazosi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/6th_grade_math_vocabulary_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/kapezivuvusotuxikazotix.pdf
    • https://cdn.shopify.com/s/files/1/0437/1097/2053/files/26425161310.pdf
    • https://cdn.shopify.com/s/files/1/0433/5242/4598/files/37785793600.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0377/files/30808965988.pdf
    • https://cdn.shopify.com/s/files/1/0431/8412/8151/files/pesemasovowevib.pdf
    • https://cdn.shopify.com/s/files/1/0437/6533/4165/files/bevimumal.pdf
    • https://cdn.shopify.com/s/files/1/0431/1135/0439/files/73231463457.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/78566702500.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/fonorixova.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_off000078a3.bin
6e3ffa59666f7663eec33650a965f1989299c4c629114567b20ea229a1be3e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A3 5288 bytes
font_01_sfnt_off00008a87.bin
7d9103d864410238d90749770c6064eb3d13ae19022959f6148188d904596e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A87 10548 bytes

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