Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d7a8112bc3ba55…

MALICIOUS

PDF

40.4 KB Created: 2020-08-16 16:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4d696cdac46a2f9e10fd17f95434571 SHA-1: b5d2d28b5dd725a8e96fe9d9cc4a36284604b3cf SHA-256: 21d7a8112bc3ba5550de8b9e9ac20ae2e2b1cca435270d8d99821481c2754b7e
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to various external resources, including a known malicious redirector. The primary lure appears to be a fake book download, indicated by the URL structure and the document body containing text related to 'Bhojpuri movie video gaan'. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection and link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/pify?keyword=bhojpuri+movie+video+gaan
    • http://files.dreadzilla.com/uploads/1/3/0/7/130775400/norokakuzid-fefigexonopekum.pdf
    • http://files.givegriefachance.com/uploads/1/3/2/7/132712447/zitexejotenunidel.pdf
    • http://nijijazaw.erinmerryn.net/uploads/1/3/0/9/130969336/kebajilabur.pdf
    • http://files.optimistclubofcarlsbad.org/uploads/1/3/1/4/131414134/4743050.pdf
    • http://files.stgeorgearizona.com/uploads/1/3/0/7/130775393/wetafobiwesekexevife.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/download_keith_moore_anatomy_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/4053/8773/files/nigozamitokijemezufotu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8920/files/vavabofaloravufuwudezi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0423/files/histologie_tissu_cartilagineux.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/kurepovoniditebij.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/skf_hydraulic_bearing_puller_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0432/8819/9328/files/toborajij.pdf
    • https://cdn.shopify.com/s/files/1/0435/4670/6088/files/nukovomowuguxuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/best_tinkers_construct_sword.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/mivizolunovuzabawolidim.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_off00004df3.bin
9499a411bbc46017f1675325eb3679563935c4d70edce7ef99650ea49ff9ff47
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DF3 5348 bytes
font_01_sfnt_off0000600e.bin
b59ba62e060a30b7aba9383b215c2aa5048764cd9930d383acfba14f1bbf4a04
pdf-font-stream PDF embedded font (sfnt) at offset 0x600E 10568 bytes
font_02_sfnt_off000083c6.bin
edf7e95c4aa754fb4a20593ee1a9183565a7200efbf1e500994f8d7a0673c10a
pdf-font-stream PDF embedded font (sfnt) at offset 0x83C6 4640 bytes