Malicious PDF — malware analysis report

Static analysis result for SHA-256 79300c994c17e40c…

MALICIOUS

PDF

43.8 KB Created: 2020-07-31 09:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96a576aeca187c2d891f09a2901ce1dd SHA-1: a11b0d96b79fdd2d1f684696818d9b036b7c6f6f SHA-256: 79300c994c17e40c12c997b811610522fb5383eb2fb70413b83514aa1dbdcaec
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, appears to be a lure related to 'Barron s toeic practice exams pdf vk'. The presence of a malicious redirector and a large number of external links suggests an attempt to drive traffic to potentially harmful content, likely for phishing or malware distribution.

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/pify?keyword=barron+s+toeic+practice+exams+pdf+vk
    • http://files.earthboundvoicesparanormal.net/uploads/1/3/1/4/131407388/390648.pdf
    • http://files.mastermindandbrain.com/uploads/1/3/2/6/132681698/fuzeg-zisakimugek.pdf
    • http://files.alpinedesignsmt.com/uploads/1/3/1/6/131606465/3687621.pdf
    • http://files.hypnomads.com/uploads/1/3/2/8/132814147/tagukakedojege.pdf
    • http://files.heroesofcolor.org/uploads/1/3/0/8/130874073/9426722.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/vuxeralaved.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/85513215109.pdf
    • https://cdn.shopify.com/s/files/1/0432/0018/4477/files/38036292009.pdf
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/nobisejetawe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87664315042.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2680/files/50481034196.pdf
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/jamifagewutitizug.pdf
    • https://cdn.shopify.com/s/files/1/0431/5719/2853/files/pekagoka.pdf
    • https://cdn.shopify.com/s/files/1/0434/1297/9869/files/rotebajemutuga.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/16860852836.pdf
    • https://cdn.shopify.com/s/files/1/0434/0894/9402/files/60760183697.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_off00006a20.bin
2400b683f7902c7f5409534b2be12b7131018c229e64615338b2e00833b2b5fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A20 5296 bytes
font_01_sfnt_off00007c15.bin
0efc0a932b09ca183ace6a78acc44a9e371829d2616f9e664c6e786b5fdf0324		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C15 11680 bytes

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