Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e4702144390ce2…

MALICIOUS

PDF

45.4 KB Created: 2020-08-31 02:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b16be34563d795e7a15bc31652a1989 SHA-1: 8d9265879b80dd77b929fef208f53fbd80264ae4 SHA-256: c3e4702144390ce295232f2fc03073263e9e97a9604753cde20c0736baba4cb2
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=trueman%2527+s+elementary+biology+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on static.usrfiles.com. The document body, though heavily obfuscated, contains the URL, suggesting a lure to disguise the malicious redirection.

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=trueman%2527+s+elementary+biology+pdf
    • https://static.usrfiles.com/ugd/ed64d2_d47624e7b42f46f99a5be8f3a4288499.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ea55b7faf6f4a14b06759d01b5ff17b.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbde945214f14f028198c3ba786c1036.pdf
    • https://static.usrfiles.com/ugd/b8c837_aaea98ca805a4118a92d760239612e5c.pdf
    • https://static.usrfiles.com/ugd/078c79_366cc322843e493ebebaf3cfa59dc47d.pdf
    • https://static.usrfiles.com/ugd/e4ff69_36cdf877254841ceb4729c8280a788fc.pdf
    • https://static.usrfiles.com/ugd/63d3ad_572411add9764285a170c96d1a706f6a.pdf
    • https://static.usrfiles.com/ugd/e23fbb_0aacc21c44b5420bafae48048750cb32.pdf
    • https://static.usrfiles.com/ugd/0049ca_86d45ffdda8f4de79f0d3e71c1f1cfab.pdf
    • https://static.usrfiles.com/ugd/8b9728_506a5fc70c9c4ac0a8619565a88f58cb.pdf
    • https://static.usrfiles.com/ugd/3e9e83_0bf11a4bf4104f6e9a04dade31661d86.pdf
    • https://static.usrfiles.com/ugd/60933b_cf17d1037fbd42a99619c9f2c255b659.pdf
    • https://static.usrfiles.com/ugd/856cea_ca82c8446b364d8ab0cef051ce4b7cf4.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_d937fec357384a369b7111a0bce843a9.pdf
    • https://static.usrfiles.com/ugd/f65518_a9baa55948ea4da59fc16150f3bc16bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3893e123da54d9893a167f3cf863578.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053b1.bin
c0d2baab581833cbaa71c3be49d2eefdbeb84637a399298694b441674fe57a03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53B1 5588 bytes
font_01_sfnt_off00006693.bin
a3fc0613295f94d0d193571187cb8228c806f0176742e1a4b04f3d3dd8990fd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6693 1748 bytes
font_02_sfnt_off00006f0a.bin
fdfd6d83dc8c201eebaf5ba8b9c92c4338afa774c1c7ce0950b57dc43a62e2b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0A 10184 bytes
font_03_sfnt_off000091d7.bin
021eaf6e245db5e9796d6b6553760bdf6420435298fcceecd052273e6f7cbf38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91D7 16488 bytes

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