Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f3757cdcd81a62…

MALICIOUS

PDF

43.9 KB Created: 2020-08-11 15:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4b1cdecb61f01aa607b4594aa7d5ed8 SHA-1: 45d70ccb9988dd21156360559ee864956451c936 SHA-256: 17f3757cdcd81a62a0deeae9d9c3710ba4bae4e76ab2bd60fa01dd3ac92e689b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to distribute malicious content. The primary attack pattern observed is the use of embedded links to redirect users to potentially harmful infrastructure.

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.cc/pify?keyword=montreal+convention+pdf
    • http://files.biologywithradjewski.com/uploads/1/3/0/7/130739522/502677.pdf
    • http://bekupepal.sonnetaccountants.co.uk/uploads/1/3/2/7/132740435/3720366.pdf
    • http://files.oceanpinesmotel.com/uploads/1/3/0/7/130776682/3fb452a.pdf
    • http://files.brianabrahamactor.com/uploads/1/3/2/7/132740865/miwutimelafutopexor.pdf
    • http://files.jeanstandmeministries.com/uploads/1/3/1/4/131407469/jonesiwugozipodo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/saluwiwekubowumidavanob.pdf
    • https://cdn.shopify.com/s/files/1/0435/4863/9391/files/the_raw_shark_texts.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/50537047482.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/mubosi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3331/1904/files/limuxuwawalakuburaper.pdf
    • https://cdn.shopify.com/s/files/1/0433/5098/2805/files/programa_arquitectonico_de_un_hotel_5_estrellas.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/epidemiologia_basica_beaglehole.pdf
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/9823315232.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ninitegabi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2179/files/genetics_a_conceptual_approach_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/96009023217.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/puranudujinelodad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gigogew.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/zip_codes_usa.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_off00006e7b.bin
3ff6948011744741158cb9c0cd42d83773fa43f6972614d5e11bd6d51e2ea2ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7B 5036 bytes
font_01_sfnt_off00007fb7.bin
8c9ccdbc6bb76c066a736ef8763f9d64e7ab10fb5b588ea40cd52e5ed43ce43a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB7 10212 bytes

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