Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b42dbf8d7f341e…

MALICIOUS

PDF

43.9 KB Created: 2020-11-03 16:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62204a335b6352327845f636bcfc1f86 SHA-1: 65e3456b5cac7475f84265f8f84eb3c59cd30b52 SHA-256: 51b42dbf8d7f341ea81813dd5737ff75af169dc052603a70391b5b27524eaaba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic further suggests a large number of external links, many of which are likely malicious or part of a link farm. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are the primary indicators of malicious activity.

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://cctraff.ru/strik?keyword=pokemon+gold+and+silver+guide
    • https://roxejane.weebly.com/uploads/1/3/4/4/134486752/dejoligaxuwizoj.pdf
    • https://wojeribexojuxu.weebly.com/uploads/1/3/1/8/131856158/bagurigovig_nufewufapupimu.pdf
    • https://sitizoxibe.weebly.com/uploads/1/3/4/3/134317871/juximalam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosagoba/clasificacion_de_accidentes_de_trabajo.pdf
    • https://uploads.strikinglycdn.com/files/8e161daf-1915-413a-a7fa-b8bdb4635f15/90309450618.pdf
    • https://s3.amazonaws.com/pugomonapoxuxe/vufimoritetopa.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/boxutoko.pdf
    • https://s3.amazonaws.com/rujabepifar/delphi_sa10001_xm_skyfi_boombox_manual.pdf
    • https://s3.amazonaws.com/rerinago/52778196656.pdf
    • https://s3.amazonaws.com/vuxalirudidel/an_experiment_in_criticism.pdf
    • https://s3.amazonaws.com/nagev/burke_s_pentad_definition.pdf
    • https://uploads.strikinglycdn.com/files/e79f68da-28b7-4db2-9b57-70a9d1e4e012/54884521204.pdf
    • https://s3.amazonaws.com/jusuberu/pale_ore_locations_hollow_knight.pdf
    • https://s3.amazonaws.com/nademopor/videl_and_gohan_son.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_off00006c12.bin
5a619e1d7d90e190904f001ede05b57a573aa296b2009787f68ee0eb8d72e27f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C12 5268 bytes
font_01_sfnt_off00007df5.bin
4127fe6a71def187ab7ecf6eda0004830b60f9494738c2d8cf8152a3feab9366
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF5 11164 bytes