Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f25d99b1e0e0fc4…

MALICIOUS

PDF

52.9 KB Created: 2020-08-10 05:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f524e2427d64e4bf977c88dcb25961eb SHA-1: 730f31e36245924d8862c882b5ed54f8e9cec7d8 SHA-256: 5f25d99b1e0e0fc40ebac597b708a7c5bdb4c82991fe638bf8733e2c824aa5ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though heavily obfuscated, contains a URL that appears to be a lure for a PDF conversion tool. The PDF_SEO_LINK_FARM heuristic suggests the PDF is part of a larger link farm, likely for SEO manipulation or distributing malicious links. 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.com/pify?keyword=adobe+convert+scan+to+pdf
    • http://files.infieldconservation.com/uploads/1/3/2/8/132814050/83a992f01f.pdf
    • http://suluworeg.nannies-pearls.net/uploads/1/3/0/8/130814328/sexafaxizadik.pdf
    • http://files.carterskennel.com/uploads/1/3/2/6/132681767/valatiwelubobod.pdf
    • http://files.wevalueourteachers.org/uploads/1/3/0/9/130969984/8660073.pdf
    • http://files.brendanswallace.com/uploads/1/3/0/8/130873945/lofera.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0757/3149/files/wuvevowugoxelifopo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0826/files/xizozudape.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/apostila_de_administrao_estratgica_em.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/65438906839.pdf
    • https://cdn.shopify.com/s/files/1/0436/0011/7928/files/fiwuwapif.pdf
    • https://cdn.shopify.com/s/files/1/0440/6578/3958/files/south_lomei_labyrinth.pdf
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/97805666648.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4011/files/80812015006.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/64127624617.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/485647809.pdf
    • https://cdn.shopify.com/s/files/1/0434/6940/6360/files/article_21_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000911f.bin
944aabc462d42fb41c1dfd27367a80a0a7a2e51ffd22d5c6d9a5610b5bb3c893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x911F 5304 bytes
font_01_sfnt_off0000a340.bin
361b0a6ed95a8a9034f11a47de694adc7c816523c8d72dc4ee006e2aa57a106f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA340 10208 bytes

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