Malicious PDF — malware analysis report

Static analysis result for SHA-256 7898c1d9b1c28fb0…

MALICIOUS

PDF

50.1 KB Created: 2020-08-06 02:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b9c13e45521760852561615571afb02 SHA-1: f464f82720b4d6494768e5bd96503a927f712ce7 SHA-256: 7898c1d9b1c28fb0f1da38892a1de2a789c38072b420e0e23c3c06b41a3148cf
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with text related to 'classifying triangles activity pdf'. The presence of numerous other links to PDF files hosted on Shopify and other domains suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing malicious redirector links.

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=classifying+triangles+activity+pdf
    • http://files.suffolksingers.co.uk/uploads/1/3/1/6/131606984/212881d88fbe6.pdf
    • http://files.completebydesigncbd.net/uploads/1/3/1/3/131384293/pogufolu-rakifebe-velut-pibutoduwebeper.pdf
    • http://files.pronkzaak.nl/uploads/1/3/0/7/130738974/zided.pdf
    • http://files.personalspaceproject.com/uploads/1/3/2/7/132740343/piwepapefa-kavijabojexopi-fuwuwumewa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7668/1882/files/wexunoxovenuna.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/78156104778.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8731/files/27841960107.pdf
    • https://cdn.shopify.com/s/files/1/0434/8503/6708/files/deep_water_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/2589/1479/files/senidebom.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6903/files/zonulobusasowazisewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3170/files/43109260864.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/xebowinazimufitakovusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0374/8263/files/lakunolilixulevu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000711e.bin
f507067017c99ca4e09fe6ba6f4bf621348b50074a5e7e4c2da367c9a124daed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711E 5392 bytes
font_01_sfnt_off00008394.bin
638b5ede33c1b2467f62d323bce13f1431f3a880eaea78398e59f5cc3864572e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8394 9992 bytes
font_02_sfnt_off0000a5e7.bin
314c85c55222e9c47571dccce4b967dbed516664fd4a23da38c55357a676f718		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5E7 16208 bytes

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