Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b362a4c5d3a6222…

MALICIOUS

PDF

47.5 KB Created: 2020-08-06 17:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d611f01980c977811133d886b35440f SHA-1: 6d08ce8a4e4e5c67bc8beea091b45adb174e2cf6 SHA-256: 0b362a4c5d3a6222d4740377ff675c51f964b39aa88e95adbe832d4ae4f520b0
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 of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests an attempt to direct the user to malicious infrastructure.

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=creative+writing+sample+pdf
    • http://files.innovativestoneart.com/uploads/1/3/0/7/130739326/dotodepulavi_renedo_pagasixazutuxub.pdf
    • http://files.sapphireriskmj.com/uploads/1/3/2/7/132740237/fc66245c53ef3.pdf
    • http://files.flowphoto-tahoe.com/uploads/1/3/2/3/132302941/fogalunomitax.pdf
    • http://files.stmarks-benson.com/uploads/1/3/0/9/130969036/dojetevo.pdf
    • http://files.harlemvibes.com/uploads/1/3/1/4/131408204/kekezitipivij-giluwolineso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6440/9764/files/vimom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7491/2410/files/sweet_maria_s_coffee.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/89532588564.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/30247251177.pdf
    • https://cdn.shopify.com/s/files/1/0435/2668/4824/files/nilinizona.pdf
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/moral_issues_in_patenting_biotechnological_inventions.pdf
    • https://cdn.shopify.com/s/files/1/0439/7583/5806/files/host_file_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0432/5782/3390/files/alter_ego_a1_livre_de_l_lve.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/56247592769.pdf
    • https://cdn.shopify.com/s/files/1/0437/5832/1818/files/sakazetomixusozez.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_off00007b72.bin
92ae9de254019873e2f9e7d46f588bc8d5a895ab54b8c5ff6f4e87e66422f43f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B72 5420 bytes
font_01_sfnt_off00008de0.bin
0520eebf9aafa4054ef33331335ec36ce96141ebd024ae16b18d5c9a9167620d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE0 10252 bytes

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