Malicious PDF — malware analysis report

Static analysis result for SHA-256 215c53817dbc4de2…

MALICIOUS

PDF

65.6 KB Created: 2020-08-22 22:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 361692045028e2cdd6ace2b74bff01c3 SHA-1: 224dde2d06d00c1763e49308530c6fa09b9eb5ce SHA-256: 215c53817dbc4de23dcc1638ee46fa2c64f1d2b833f10ea915259be2a3bfbf67
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a critical heuristic firing indicating it links to known malicious redirector infrastructure. It also contains a mass external PDF link farm, with many links pointing to `cdn.shopify.com` and other domains. The primary malicious URL identified is `https://ttraff.ru/pify?keyword=despacito+remix+bass+boosted+song`, which is likely used to redirect users to further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=despacito+remix+bass+boosted+song
    • http://xilijevok.aikenhistoryfchs.com/uploads/1/3/1/3/131384260/gejovigosapume.pdf
    • http://files.photocolorongraphics.org/uploads/1/3/1/6/131606807/zodulekavemojewi.pdf
    • http://nidoja.wallartandpresents.co.uk/uploads/1/3/1/4/131407535/jipaxafopipemepopo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/47554539811.pdf
    • https://cdn.shopify.com/s/files/1/0439/0082/9848/files/important_functions_in_excel.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/20378877290.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/22116998161.pdf
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/7902405498.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6615/files/free_evinrude_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1703/files/15966357690.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/narifed.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009961.bin
4ee2cedf8c315c20cfd1888a126562de1ae81f0eea1dc2452303c56759f75f16		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9961 10460 bytes
font_00_sfnt_off00006f89.bin
709d1c552708da4237bb402f53e623b0cc7e3f4b09e70dcab6c866686e856f8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F89 6776 bytes
font_01_sfnt_off00008695.bin
7978cb6c2cfc38b52a0d5045b6d7b78dc1f9ad2586ff371db3d0e66478191861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8695 5568 bytes
font_03_sfnt_off0000b6e5.bin
a22569468227264290d70a64e338812a012cea8b39507e74bdf0aac0f2a06899		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E5 9916 bytes
font_04_sfnt_off0000d874.bin
90d00b76b71f8c53d4db0a8816e4b2132ac4dac197cc545d243f30b214313fd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 18948 bytes

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