Malicious PDF — malware analysis report

Static analysis result for SHA-256 44aa20c816cfe963…

MALICIOUS

PDF

51.3 KB Created: 2020-08-31 14:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df22df204c457d55b813fba708ddbe8c SHA-1: 67b4ed570914b0bc2e822b36f03b0c43edb52e06 SHA-256: 44aa20c816cfe96340c96a3619ee054e1fe6ecd9bca438dfdd97f46ef07fa2bc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, https://ttraff.com/wix?keyword=horizon+zero+dawn+complete+edition+strategy+guide, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on static.usrfiles.com and cdn.shopify.com, suggesting a link farm or SEO poisoning tactic to distribute malicious content.

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/wix?keyword=horizon+zero+dawn+complete+edition+strategy+guide
    • https://static.usrfiles.com/ugd/b8c837_19e102540730479fa24403e4e216ae7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf6ce08e6b9b417290052f397acb753e.pdf
    • https://static.usrfiles.com/ugd/04e6f9_098cfec8f4aa43a8a64e57b7549b74ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_304c82db875343c7814cc21b1dfc30bc.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/19785230703.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/5338847434.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/warajopalerajari.pdf
    • https://static.usrfiles.com/ugd/b8c837_65257470cdfa4353843b286775c9c074.pdf
    • https://static.usrfiles.com/ugd/7c30af_51539f07d883422ab2d27a61f4c4e11a.pdf
    • https://static.usrfiles.com/ugd/b8c837_232b2ce46f504b449e36880dc647fa5a.pdf
    • https://static.usrfiles.com/ugd/9c43ec_8b6294095d8a4016a6dd08336e2e7690.pdf
    • https://static.usrfiles.com/ugd/4c1554_0bc70fe362104593aaf775ddab4453e8.pdf
    • https://static.usrfiles.com/ugd/4479ed_203a77ed9a9944b7ac8845382c7a8ea0.pdf
    • https://static.usrfiles.com/ugd/b8c837_59113c651986438ead92e5863b34f416.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c38232bcb744ef8919d9fbf7e0ddbee.pdf
    • https://static.usrfiles.com/ugd/48f461_d800305176824444a2f37b2260aa4afd.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008931.bin
0c3e2a4f6726caffe8467ee975aea075413c212d248e29316ffec0c6ea2163ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8931 5600 bytes
font_01_sfnt_off00009c41.bin
c5ef793eddfbc69f9b6dc18f98dc281aed7cf949616adf44a61e05f1a82445d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C41 10560 bytes

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