Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd13e13d29f8a66…

MALICIOUS

PDF

51.4 KB Created: 2020-07-31 02:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9aa4a4dae616d91186ef0d33dd64e7ab SHA-1: 82418ba59161bde83b64a2db170726c76291c7e1 SHA-256: 5bd13e13d29f8a66cd1a3ad0318fd231034b702361d4b9bbc97a14c5f3c400bf
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification point towards a malicious intent to redirect users to potentially harmful sites.

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/pify?keyword=abanico+espa%25C3%25B1ol+pdf
    • http://files.lssbaseballacademy.com/uploads/1/3/1/3/131383604/nivuvewaxununa.pdf
    • http://files.brewerfirstrobotics.com/uploads/1/3/1/8/131872055/1333881.pdf
    • http://files.higherlevelevents.co.uk/uploads/1/3/2/3/132302710/zomevekifike.pdf
    • http://files.majesticgodscollection.net/uploads/1/3/0/7/130775135/f5f175a00c38.pdf
    • http://files.blossomholistichealth.com/uploads/1/3/0/7/130776451/1045447.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0432/6850/5764/files/gegadotiwogabazas.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/4752832662.pdf
    • https://cdn.shopify.com/s/files/1/0431/0731/9974/files/17972457477.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/38660797439.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/13410916251.pdf
    • https://cdn.shopify.com/s/files/1/0434/4938/5126/files/30755408510.pdf
    • https://cdn.shopify.com/s/files/1/0439/3664/5275/files/56694183528.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/finudet.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/kekifijuputatuxiwimarobu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/veporiwotizatumajifulizag.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7739/files/zupezupogujudaxutedopape.pdf
    • https://cdn.shopify.com/s/files/1/0432/3917/8399/files/80284973416.pdf
    • https://cdn.shopify.com/s/files/1/0431/6092/8405/files/tokujodekumeloxojagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7152/8344/files/49590007138.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080bc.bin
fa711628b5f15683f68034f64b0bba11e92ab572975625fdb6a077d629c15aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BC 5104 bytes
font_01_sfnt_off000091c2.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C2 1800 bytes
font_02_sfnt_off00009a50.bin
1f09ffdce45c147f533950c45d353ff92506eaf46382d33901912d239ed44b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A50 11044 bytes

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