Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1fdbb5b0dcc839…

MALICIOUS

PDF

41.8 KB Created: 2020-08-23 11:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96ab72f152239cbae1899cee007bad13 SHA-1: af04b97046dc7b8967b415a0ce70ec754483f282 SHA-256: 9f1fdbb5b0dcc8398620c252a703bc6e06f7232cf425e0ecdb4504524d5dd117
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. The document body, though partially corrupted, contains text related to 'Metformin xr gi side effects' and the authoring application 'wkhtmltopdf', suggesting a lure to a malicious site disguised as information. The ML classifier strongly flagged this PDF as malicious.

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=metformin+xr+gi+side+effects
    • http://files.sierpefrogs.com/uploads/1/3/0/8/130874587/wugerizobe_moloborimufin.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6188/files/tozasuneveludadimabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2922/4857/files/concepto_de_defensa_nacional.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/memepid.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/woxadagenus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0433/0569/7438/files/34314147551.pdf
    • https://cdn.shopify.com/s/files/1/0430/8644/6746/files/swg_afk_grinding_spots.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/article_grammar_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/goviwejesuwepewokigoko.pdf
    • https://cdn.shopify.com/s/files/1/0428/7863/2095/files/92626847094.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_off000065be.bin
ab4f7d37dfef566b54da621b1f2458f875f59de10d6d72a20b08ed918b851498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BE 5172 bytes
font_01_sfnt_off00007757.bin
b81ccd71c8aba49e13395e1228d19031afdffa961b0b7c2f9371f1a89babe63c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7757 10328 bytes

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