Malicious PDF — malware analysis report

Static analysis result for SHA-256 181878457e4d4833…

MALICIOUS

PDF

51.9 KB Created: 2020-08-29 07:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08e72bd68b4708d634b59dcf515dc790 SHA-1: db9e161162668ecccc62e04d3c267fa4df566867 SHA-256: 181878457e4d483339febe76504b92b649907806702b3d6e2d7dc54f48939cc6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a title and a URL, suggesting a lure. The presence of a link farm and a malicious redirector indicates an attempt to lead the user to a harmful site, likely for further exploitation or phishing.

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/wix?keyword=civil+disobedience+and+other+essays+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2384/2983/files/mogoboxeno.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/2997/files/69785410386.pdf
    • https://cdn.shopify.com/s/files/1/0461/8944/5283/files/gcse_history_past_papers_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3082/files/internship_report_for_computer_science_students.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/honda_trx_500_service_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/application_letter_for_secondary_teacher.pdf
    • https://cdn.shopify.com/s/files/1/0438/6032/8608/files/gupawubinibupiveputijam.pdf
    • https://cdn.shopify.com/s/files/1/0429/7401/9740/files/altium_designer_pcb_layout_tutorial.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc102151c145408da4fd1d363b2187d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_6978288d82fa4dec97c2966f9736cd85.pdf
    • https://static.usrfiles.com/ugd/b8c837_98c42a7bebad40b3bb10e7c6e3deba65.pdf
    • https://static.usrfiles.com/ugd/b8c837_f577c71b25d34336a75ae439f6210a03.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_off00008d9d.bin
b5922e4b13809487af6f83ecae59cf00bb692b5629128cf44af41127ea18d9f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D9D 5448 bytes
font_01_sfnt_off0000a01e.bin
8e9106ca24f04db6b320b09f21deade2f45a9bea6101483f452e1b3b458eade4
pdf-font-stream PDF embedded font (sfnt) at offset 0xA01E 10124 bytes