Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e6bb46da277d4f…

MALICIOUS

PDF

44.4 KB Created: 2020-10-03 06:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cffdeb0c0c7fd3cd179144b083629b17 SHA-1: 54e69d5626ff57790f22ec0122f05648b35fd0f5 SHA-256: 77e6bb46da277d4f444f2d76ca7015e1eb9bb279057285888c611f020d1f9ae2
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, while appearing to be a guide, contains obfuscated content and a URL that likely serves as a lure to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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 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.
  • 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=how+to+make+a+zombie+shooting+game+in+scratch In PDF document text
    • https://site-1037906.mozfiles.com/files/1037906/xilenaperul.pdfIn PDF document text
    • https://site-1038553.mozfiles.com/files/1038553/49202852012.pdfIn PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/7030742708.pdfIn PDF document text
    • https://site-1036742.mozfiles.com/files/1036742/902428553.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/jofaloxuxazaviwom.pdfIn PDF document text
    • http://zixaj.minutiamuse.com/uploads/1/3/1/6/131636698/zofokoxebo_mebib_dumigeranovel.pdfIn PDF document text
    • http://files.garycordingley.co.uk/uploads/1/3/1/4/131452804/vidogig.pdfIn PDF document text
    • http://files.marymccool.com/uploads/1/3/1/8/131856539/pifiwid_bupifowatu_webefuvibaborin.pdfIn PDF document text
    • http://watok.artisanhandfood.com/uploads/1/3/2/7/132712336/jetuliwamebu_jevotojig_naxuposa.pdfIn PDF document text
    • http://luxedafa.jocoworks.net/uploads/1/3/1/8/131871390/5289474.pdfIn PDF document text
    • http://fizejema.churchoftheholyspirit.org/uploads/1/3/2/6/132696558/e16e73.pdfIn PDF document text
    • http://files.chopshopsaladshop.com/uploads/1/3/2/6/132680808/xusiguvifo_tatosimod_dijikebago_wofidi.pdfIn PDF document text
    • http://mupajilus.marine-ropes.net/uploads/1/3/2/6/132681268/xatafudejelam.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/8b50ec53-3f5a-4e0b-bf44-d01ddc8b112a/76019962966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87e7496a-04eb-44a9-b1fb-f407e325db45/bimibabibutabaxeteb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5001fc9-c4fe-41a4-91c3-eb253096bb15/wunuxe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4A 5488 bytes
SHA-256: 4a4ca2b2e3d5421a9ea58ca607e457dbbd118be8e0a4e301581722d2ce1ce003
font_01_sfnt_off000081e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81E7 10128 bytes
SHA-256: bb7a8b950332b8a74b063db43bd039356dbd4409001f6a409eef583bbad4d355

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