Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5ffdb7ad1edf48…

MALICIOUS

PDF

51.6 KB Created: 2020-10-05 12:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c21d78951b55a225470a421e5ee08a16 SHA-1: 14289db3433be00871cabda6c18d13594162c7b3 SHA-256: fe5ffdb7ad1edf486a246d6ccbefc99fcbe2096554d68f04b58bde4f62b53707
184 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, disguised with a search query for a repair manual. The ML classifier strongly indicates maliciousness. The embedded content, though obfuscated, includes a URL that likely serves as the initial point of contact for a malicious payload or further redirection.

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 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.
  • 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://ttraff.link/pify?keyword=1969+vw+beetle+repair+manual+pdf+free In PDF document text
    • https://site-1039875.mozfiles.com/files/1039875/43040745152.pdfIn PDF document text
    • https://site-1038323.mozfiles.com/files/1038323/linojomepomuz.pdfIn PDF document text
    • https://site-1043314.mozfiles.com/files/1043314/bulimulufimenupabusiwiba.pdfIn PDF document text
    • https://site-1039132.mozfiles.com/files/1039132/84264498560.pdfIn PDF document text
    • http://files.cagecommerical.com/uploads/1/3/1/6/131606546/eccdead.pdfIn PDF document text
    • http://files.annemcmillslighting.com/uploads/1/3/0/7/130740437/wabarepeg-xiwosuraw.pdfIn PDF document text
    • http://files.firstchoicedjservice.com/uploads/1/3/0/7/130738801/6666120.pdfIn PDF document text
    • https://site-1036733.mozfiles.com/files/1036733/84403106810.pdfIn PDF document text
    • https://site-1039135.mozfiles.com/files/1039135/9104377774.pdfIn PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/41040406515.pdfIn PDF document text
    • https://site-1043032.mozfiles.com/files/1043032/71928685416.pdfIn PDF document text
    • http://files.ingridlavoiepapercutting.com/uploads/1/3/0/7/130775503/1997d02074.pdfIn PDF document text
    • http://files.woeschwiiber.com/uploads/1/3/0/7/130739918/689356.pdfIn PDF document text
    • http://sugexez.openthedoorleadership.com/uploads/1/3/1/4/131453558/dadixexoxovore_zezax_zigitetob.pdfIn PDF document text
    • http://files.ehmotorcredit.com/uploads/1/3/1/3/131379590/6901647.pdfIn PDF document text
    • http://kudalelu.readingroom.ca/uploads/1/3/2/6/132681370/6842441.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00008bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBF 5568 bytes
SHA-256: 911b36a6e060831a807192dcdc8f894334c46484639aa46f5bfd164452f92310
font_01_sfnt_off00009e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E9F 10120 bytes
SHA-256: 149c6c95c02ef6ce986f22035d2259612085c89a68c5e5468e4d5dfe2d78b064

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