Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c7cf0f8b33fa43…

MALICIOUS

PDF

45.2 KB Created: 2020-08-21 20:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b3f7f4fecd4ad8fd1d7c2fb4541f9b2 SHA-1: 19f485565390ba1d5fb90b4c37dd1227e491ab2d SHA-256: 12c7cf0f8b33fa4339dd6cdb58671a8fcc066a8e8bf5425c384be845ea6217c4
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure to external content. The presence of a link farm heuristic further indicates an attempt to distribute malicious content or manipulate search engine results.

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=325+card+game
    • http://files.homesteadgardenshv.com/uploads/1/3/0/7/130739427/donotubig-konifipi-demezabe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3009/1688/files/tetagusunuviwip.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/xaxufimewejafixuzegoveju.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0429/files/bsc_1st_year_zoology_notes_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/data_structures_and_algorithms_made_easy_in_java_karumanchi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/46338403418.pdf
    • https://cdn.shopify.com/s/files/1/0437/0422/1849/files/ponuxozinidijemav.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/28371470964.pdf
    • https://cdn.shopify.com/s/files/1/0433/9751/3381/files/8082996413.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3783/files/93723448230.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_off000072a8.bin
3c13d47234647466491452f305c38d90653a849cf55a03d157f1841550a0eebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A8 5376 bytes
font_01_sfnt_off000084c3.bin
b741c7fbf0d5113146d502a8654c582bcf3498d8189b14f06b888e06ba841f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C3 10484 bytes

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