Malicious PDF — malware analysis report

Static analysis result for SHA-256 054b4d2222e3d2f4…

MALICIOUS

PDF

40.1 KB Created: 2020-08-10 12:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09c63c4e642ccd15f6abd2649cc05559 SHA-1: 3a91a938c1d7523c8e84b28de65ee71d19cb33bd SHA-256: 054b4d2222e3d2f4f3943443b41318a4b1264a4774a76c4d459920d93e77a19b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'https://ttraff.ru/pify?keyword=chemistry+atomic+structure+questions+pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier 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=chemistry+atomic+structure+questions+pdf
    • http://files.idealformsnyc.com/uploads/1/3/0/8/130813859/ab44336dc432f9.pdf
    • http://putur.northbristolrfc.co.uk/uploads/1/3/1/4/131406149/c89d9d615b.pdf
    • http://tulini.thebeachcompanysc.com/uploads/1/3/0/7/130739204/7b8dd55425761c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7190/5698/files/44930432911.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/rodebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5032/7454/files/mejalozitemabavedulowap.pdf
    • https://cdn.shopify.com/s/files/1/0434/0691/7799/files/the_divide_2011.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2557/files/zetib.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/demelebizemajixug.pdf
    • https://cdn.shopify.com/s/files/1/0434/2625/0901/files/vipibi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4372/4186/files/34332485683.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/36014779873.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/34758283836.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6435/files/footlocker_wheaton_mall.pdf
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/69681856932.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/xewofupajotunokefizuzal.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005013.bin
985ff5a8863fb327b8439f333387f0434ac4c905cccc09962416c16bdd437e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5013 5496 bytes
font_01_sfnt_off0000629d.bin
cf8ee15553f6e03d30157c696ea135a0b03fad7be6bc3dbc8e70e0ac4ba3f852		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629D 10120 bytes
font_02_sfnt_off00008549.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8549 4324 bytes

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