Malicious PDF — malware analysis report

Static analysis result for SHA-256 621cafc1aafa4eb1…

MALICIOUS

PDF

49.3 KB Created: 2020-08-31 16:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acc3d33bc775bdf908ea9873c1cac594 SHA-1: b3a301fa6c6e4e9ab79f677c92a311e1b7fa4d7f SHA-256: 621cafc1aafa4eb1ca55c551cee510c0097c90a5514f0ae10a74a8765dc0cfe1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and IOCs. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent.

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/wix?keyword=gestational+hypertension+guidelines+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/zerim.pdf
    • https://cdn.shopify.com/s/files/1/0435/1256/1819/files/19155755270.pdf
    • https://cdn.shopify.com/s/files/1/0435/4002/1407/files/83003623617.pdf
    • https://static.usrfiles.com/ugd/e1c37d_dd2f1f88c34a457caa4025ae50446cd1.pdf
    • https://static.usrfiles.com/ugd/64d889_e00b7c1f2f704360a08916087aecc036.pdf
    • https://static.usrfiles.com/ugd/7ff653_61bf6d4367ad4f5b846a654654cdca6f.pdf
    • https://cdn.shopify.com/s/files/1/0447/2376/5402/files/human_biological_diversity_brown.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/water_resources_engineering_mays_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/pudilejokabuparelopomage.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_off00008032.bin
9e2ecbcb64745dcda2201d39491a5f6d51f72defe22c027f983290f8d9cb9f37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8032 5436 bytes
font_01_sfnt_off000092b5.bin
66c149f2d4eac3ee7da21c668bbc7ef9fb08367de68a6519b55004e05c738bf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92B5 11184 bytes

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