Malicious PDF — malware analysis report

Static analysis result for SHA-256 f883d2cb40fba839…

MALICIOUS

PDF

44.6 KB Created: 2020-10-07 11:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b14e35288ac845c1c2891586facdaf56 SHA-1: e31e27e9567944b3ffe21b6e1bc4ab98f9fb39fb SHA-256: f883d2cb40fba839a32f6ec830f00e3d450a5f315ef82dd1666cb03d6963f162
132 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'SE_URGENCY_LURE' suggests the document uses time-sensitive language to prompt user interaction. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gettraff.ru/strik?keyword=aisi+1020+pdf In PDF document text
    • http://vevudiw.livephierce.com/uploads/1/3/1/4/131437889/a74084c23703.pdfIn PDF document text
    • http://sisug.wetakeitpersonalsales.com/uploads/1/3/1/3/131383388/29f3ca4.pdfIn PDF document text
    • http://files.digitalxraypros.com/uploads/1/3/0/7/130739646/f98919.pdfIn PDF document text
    • http://files.lovemayberry.com/uploads/1/3/1/6/131637103/5410743.pdfIn PDF document text
    • http://dalixu.bayridgeschool.org/uploads/1/3/1/1/131164312/vusebatilusuj_puviwomik_sixulutunazon.pdfIn PDF document text
    • https://site-1038614.mozfiles.com/files/1038614/bejuropigip.pdfIn PDF document text
    • https://site-1036748.mozfiles.com/files/1036748/sudobuwuwawusumizu.pdfIn PDF document text
    • https://site-1044200.mozfiles.com/files/1044200/widorimon.pdfIn PDF document text
    • https://site-1041295.mozfiles.com/files/1041295/588056525.pdfIn PDF document text
    • https://site-1040521.mozfiles.com/files/1040521/nudijilibimedibizaxobix.pdfIn PDF document text
    • http://files.atnscdoula.com/uploads/1/3/1/3/131397981/6668397.pdfIn PDF document text
    • http://files.fltechnical.com/uploads/1/3/2/6/132696351/501d92604b1ec1f.pdfIn PDF document text
    • http://lofunudo.sacredsummitchocolate.com/uploads/1/3/2/8/132814930/gorivezorokid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b8c6e1a-0788-4781-a5a2-322e398ab6ae/12593372721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb19111-3f9b-4fda-9e80-3e27987e2368/8489006089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36de1ae2-745a-41ed-8968-3e9f8057ddcc/tusironitumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d33094-6aaa-4d11-a7a7-93143daf0971/punimaxuvujewujuvezojux.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64CB 3028 bytes
SHA-256: dabe7c97521a3bc8cdefebb44444775986ad5d9fd98a68245ca7ea15aa4d3e51
font_01_sfnt_off00006f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F92 5012 bytes
SHA-256: 2eb6224107d48f291ef981498155171625304a467a55c54920de8d2edb8a7839
font_02_sfnt_off000080c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C9 10668 bytes
SHA-256: 6d11ebd8d96575358b1dbdb24cd6e3c0e4570ad558b4ac578ba125fb1bed6aa3

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