Malicious PDF — malware analysis report

Static analysis result for SHA-256 752e5d691a0cb563…

MALICIOUS

PDF

38.2 KB Created: 2020-08-15 17:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dacff0fa64f1a158dbbbd4679030cd83 SHA-1: 3f22e6978ab966172700414e343d2f3f0c167ab9 SHA-256: 752e5d691a0cb56327249184a0d91e21312d868c2d9694c8a47212484fa2172f
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, disguised as a quality control manual. The ML classifier strongly indicated maliciousness, and the document body itself contains the malicious URL. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt 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.cc/wb?keyword=manual%20de%20control%20de%20calidad%20interno%20laboratorio%20clinico
    • http://files.wfut.org/uploads/1/3/1/3/131379312/lonudobet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/53257510319.pdf
    • https://cdn.shopify.com/s/files/1/0447/9077/5965/files/bayes_optimal_classifier.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/playstation_portable_video_converter.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/compress_file_size.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/xanin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8054/files/44576113701.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9736/files/miller_thunderbolt_xl.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/33286017662.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_off000059c0.bin
799f8457f63254544623484af0f06c6d3d6d3e62f9194e8e0fc3ad1041248390		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C0 4900 bytes
font_01_sfnt_off00006a71.bin
922be1bead8297972ae39ac1fcfb34d28dd60de867e9a0bb69c6079c42365e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A71 9796 bytes

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