Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f3dae357c3a12b…

MALICIOUS

PDF

44.6 KB Created: 2020-07-18 20:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e76021887416014f85036ca3d279204 SHA-1: 3aab9347ee24b9c9a1b07733a9b13ec8f9181e10 SHA-256: 14f3dae357c3a12bf5d342de06264673887bfa316bb955f60f759d1fa520ab51
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/wb?keyword=basic%20english%20worksheets%20for%20spanish%20speakers'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern involves luring users to potentially harmful URLs.

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.com/wb?keyword=basic%20english%20worksheets%20for%20spanish%20speakers
    • http://files.jssirite.com/uploads/1/3/0/7/130738568/ruratogepozeji.pdf
    • http://files.grettawilson.com/uploads/1/3/1/4/131437351/5306487.pdf
    • http://files.totallylogicalfear.com/uploads/1/3/1/4/131452935/lukinosuwu-wozeputukedu-badoka-sivapif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vamosusugul.files.wordpress.com/2020/07/lezut.pdf
    • https://xakisujufo.files.wordpress.com/2020/06/85887768502.pdf
    • https://nagivujopig.files.wordpress.com/2020/07/papavisibojakeneluve.pdf
    • https://kotosidimof.files.wordpress.com/2020/06/68865030760.pdf
    • https://midogafabub.files.wordpress.com/2020/06/29444345651.pdf
    • https://tododuk.files.wordpress.com/2020/07/24367546418.pdf
    • https://fulazetula.files.wordpress.com/2020/06/seluzanuza.pdf
    • https://gofenibom187364652.files.wordpress.com/2020/07/fenosagu.pdf
    • https://xolufoje.files.wordpress.com/2020/07/49155388844.pdf
    • https://zaguzewurufo.files.wordpress.com/2020/06/gedigepiwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0974/4789/files/59302106119.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/zabipejosivugul.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/31085364099.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/zitaderugafawakusamov.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/bofujinetaralepijina.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/juzoxuwedurodowemiledirol.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/mebifubevevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23651487672.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_off000070c1.bin
b8cf7fd8d520a74670f1e9a62be48e9f03b5ecb4d67ff2bdbd3daf264905c999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C1 5268 bytes
font_01_sfnt_off000082ae.bin
48b8b74675d297d085560fccb88dd547f8b168493f52de9140dccbfe5ddb3e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82AE 10032 bytes

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