Malicious PDF — malware analysis report

Static analysis result for SHA-256 8126a9e465b4c06a…

MALICIOUS

PDF

36.3 KB Created: 2020-09-01 00:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c34b01b001b681310053717c3ba970a SHA-1: ff486eaf0e7ef63849e7ecbaf2fc87aa452afc9e SHA-256: 8126a9e465b4c06aecd2a00e54ecfaeb8b3fe702d050743323f5c61b2e789a20
162 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=asme+wps+format'. The document also exhibits characteristics of a link farm, embedding numerous external PDF links, one of which is 'https://cdn.shopify.com/s/files/1/0429/5180/3039/files/plc_fault_finding_guide.pdf'. The presence of a 'download button' lure further suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=asme+wps+format
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5180/3039/files/plc_fault_finding_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/expanding_and_simplifying_algebraic_expressions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/1264/3227/files/square_roots_of_negative_numbers_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/8970/6664/files/calistenia_yerai.pdf
    • https://static.usrfiles.com/ugd/b8c837_4642d540326f485aa8d498c1c2a6bf8e.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_6c7f203dfc704b7fb500750965040080.pdf
    • https://static.usrfiles.com/ugd/b8c837_a29c0173d06040b0b845b4705acdf5d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_8aa3dbcd44aa40ca97dd00f81ea170fe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5026/0890/files/32529885523.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2628/files/pozipilutukofotipol.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/10774183444.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/devevefatogisetadan.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/lipazipumomopipegutumilu.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_off000050f6.bin
649662a02e8a084a9d1f02a38d4e33c3e635409fb409dad14abac6fd5c6c3beb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F6 5096 bytes
font_01_sfnt_off00006245.bin
fb4c17a598d7700ed56ef196530c6e617ae640e807e81796bf82b1fc90218c20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6245 10360 bytes

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