Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ebeb027de6093e…

MALICIOUS

PDF

45.4 KB Created: 2020-07-21 02:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e47b7d64a52ab55fbbf296330591b36 SHA-1: 0c5d7d05d69c8d8ebae65970dacc2d758d3edf6a SHA-256: b5ebeb027de6093e4753973be0359fa03e0f6dba64c8419cd39540e06b8bb39d
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for redirecting users to malicious sites. One such link, 'https://ttraff.ru/wb?keyword=mathe%20geometrie%20klasse%204%20pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain metadata related to 'wkhtmltopdf' and a date, suggesting it was programmatically generated. The presence of a link farm indicates an attempt to manipulate search engine results or distribute malicious links broadly.

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/wb?keyword=mathe%20geometrie%20klasse%204%20pdf
    • http://files.vetiverandsage.com/uploads/1/3/1/3/131398268/zafovukefidax-kilubefetisijat-zasadono.pdf
    • http://files.bounce4batten.com/uploads/1/3/0/8/130815137/7621e77479fa2.pdf
    • http://files.sawfishonline.com/uploads/1/3/1/4/131406391/deginut.pdf
    • http://files.intensitycheeranddance.com/uploads/1/3/0/7/130739505/xinav.pdf
    • http://files.intensitycheerand
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/rejaridutokofivetosopug.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3908/files/jomarosorekupap.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/limis.pdf
    • https://cdn.shopify.com/s/files/1/0437/3181/2504/files/4642750390.pdf
    • https://dekabivegu.files.wordpress.com/2020/06/71215762780.pdf
    • https://jekevak.files.wordpress.com/2020/07/96474815664.pdf
    • https://tudenobinedu359522656.files.wordpress.com/2020/07/52059039200.pdf
    • https://cdn.shopify.com/s/files/1/0434/5069/5830/files/13154011230.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4023/files/91385854696.pdf
    • https://cdn.shopify.com/s/files/1/0429/9931/6639/files/48838610577.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5784/files/fujuroboxobozujake.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/48209538589.pdf
    • https://cdn.shopify.com/s/files/1/0435/1010/4228/files/xukal.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/desuratiruzawulo.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_off000071d3.bin
e8389d3e8376d4a878453a2110e52128f6ad4adbde26d2a0f2dab2ff8216a1f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D3 5292 bytes
font_01_sfnt_off000083e4.bin
7f22acbfb3710586f0fa48f7b4e17859fe529ecc017cae93437145cafd2430da
pdf-font-stream PDF embedded font (sfnt) at offset 0x83E4 10628 bytes