Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d86dafe32afc43…

MALICIOUS

PDF

47.5 KB Created: 2020-08-12 14:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb3edd6cb5817bf161675001cd573feb SHA-1: 56c9ab7f3b94128e2302660b86b4ef88536b8b29 SHA-256: b9d86dafe32afc437e722c258e0df336d3bb4145bf0393c231bc4119dbfef31c
128 Risk Score

Malware Insights

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

The PDF contains a link farm designed to manipulate search engine results, directing users to a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wb?keyword=biology%20notes%20for%20class%2012%20chapter%20wise%20pdf%20hsc', which is flagged as malicious. The presence of numerous benign-looking Shopify links suggests an attempt to camouflage the malicious redirector within a larger set of URLs.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=biology%20notes%20for%20class%2012%20chapter%20wise%20pdf%20hsc
    • http://pagakamam.craftofscientificpresentations.com/uploads/1/3/0/7/130739385/4263c0.pdf
    • http://files.handsomestitchery.com/uploads/1/3/2/7/132712225/4365496.pdf
    • http://files.rangersafc.co.nz/uploads/1/3/0/7/130775135/bosese.pdf
    • http://files.momentsbyannephotography.com/uploads/1/3/1/0/131070459/9428582.pdf
    • http://files.unicomdesign.eu/uploads/1/3/1/1/131164236/b035f66b.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/mosoterim.pdf
    • https://cdn.shopify.com/s/files/1/0440/1243/7662/files/sabesetumimigusimutojib.pdf
    • https://cdn.shopify.com/s/files/1/0434/3254/2369/files/29818181629.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2519/files/22498113921.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://cdn.shopify.com/s/files/1/0451/8638/4023/files/cartoon_drawing_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0434/7609/1045/files/68290344868.pdf
    • https://cdn.shopify.com/s/files/1/0432/1656/8482/files/91317904351.pdf
    • https://cdn.shopify.com/s/files/1/0434/3382/0322/files/5174364132.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5753/files/17375412055.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_off00007a37.bin
3e9fb775e22d9ed6d3557c1898c28e9a44e22dcede8e33b6998505605ebd439e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A37 5844 bytes
font_01_sfnt_off00008e32.bin
9c45a2906d57007363d3d1bcb4d475a26ff3ce027bd025d03d39af9576280252
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E32 10180 bytes