Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c25d950a60e44e2…

MALICIOUS

PDF

33.6 KB Created: 2020-08-20 19:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2b5a9332bacad6efae7a8088d414f4c SHA-1: 4c8c77046e8bfddc1a42e0fb133b7896115a15ce SHA-256: 5c25d950a60e44e2109fe1f37ef546b38ac65b25a7322fc938ccea5bb7ea9ae4
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is masquerading as a 'Downers grove police annual report' and includes the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external PDF links, many pointing to Shopify domains, suggests a link farm intended to obscure the ultimate malicious destination.

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=downers+grove+police+annual+report
    • http://files.taxidermytrainingunlimited.com/uploads/1/3/1/4/131453463/fesog.pdf
    • http://files.thegeorgiaruthhouse.com/uploads/1/3/1/8/131871501/0d6ca592f82e6ea.pdf
    • http://files.theamericanbrabantassociation.net/uploads/1/3/1/8/131857476/4053415.pdf
    • http://rexug.annefriend.com/uploads/1/3/2/6/132682974/6416446.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0634/5895/files/assetto_corsa_gt3_cars.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/bavire_guide_du_routard.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/17969728257.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1072/files/5155827386.pdf
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/komugi.pdf
    • https://cdn.shopify.com/s/files/1/0441/1562/4088/files/inference_worksheet_8th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0454/6284/7640/files/57486629151.pdf
    • https://cdn.shopify.com/s/files/1/0432/2548/1379/files/advanced_development_economics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42539854631.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/cengage_chemistry_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/57442784856.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_off00004665.bin
f9af4e809ebed7c94f13a457791b595b5efe7e7a14bbd3664b26606ff1f267a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4665 5252 bytes
font_01_sfnt_off00005872.bin
8edec5c70e691a08b8ec1545d49252af94a95f02e8143457b8ee8f63bf37f06c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5872 9760 bytes

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