Malicious PDF — malware analysis report

Static analysis result for SHA-256 816c25d492574727…

MALICIOUS

PDF

40.8 KB Created: 2020-10-07 00:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: df085ee91f8ed6a6890d051e8df98458 SHA-1: bc63ca824c7df06308cd5e090635f629137cdd9b SHA-256: 816c25d49257472706bbdc745627b36b1d61157a7e78058c09ed76f0229b6b1e
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or redirector services. One critical heuristic identified a link to a known malicious redirector, ttraff.club, which is likely used to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

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.club/pify?keyword=ferris+bueller%2527s+day+off+quotes+cameron+frye In PDF document text
    • https://site-1037145.mozfiles.com/files/1037145/merubeju.pdfIn PDF document text
    • https://site-1041860.mozfiles.com/files/1041860/dufizatez.pdfIn PDF document text
    • https://site-1039778.mozfiles.com/files/1039778/bazufegitivemuberef.pdfIn PDF document text
    • https://site-1048166.mozfiles.com/files/1048166/33183534511.pdfIn PDF document text
    • http://files.thomfogartypresents.com/uploads/1/3/1/1/131164462/wimazozedawadotetop.pdfIn PDF document text
    • http://files.biodanzausa.com/uploads/1/3/1/1/131164295/b23902bd5dbdb2.pdfIn PDF document text
    • http://kejosow.thewellonbeacon.com/uploads/1/3/0/7/130740072/9d2463ee377d53.pdfIn PDF document text
    • http://files.gatorholecountrystore.com/uploads/1/3/0/7/130776841/1864564.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/2c92d367-ec44-4fcb-8067-cff2d64697e3/vorosizelume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/583a805a-79f8-4292-861c-23ce7842da35/dogotakoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db44f7f-3d9e-42f9-943d-9d44cf86c0a7/ruvoxexaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a93aa8-c3b6-414e-8db8-199c1ee1f181/97322174920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7885b298-ce59-4b97-9566-8834a9bea1f8/23213170455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a85724c-9583-4843-a654-d30e89f6cbf0/71347362930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0892128d-1c9e-436f-a60d-cf9defd47a6e/83056253082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de386de2-df6a-4406-80c5-4ae54a4d77ea/sozamesot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e442d9-daf1-4c12-baf0-e609ea991de3/48491845123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baede8fd-c9d2-4a69-a7b5-eb766883955e/82901847547.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_off00006001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6001 5524 bytes
SHA-256: 21ed7a29aa1e00dd9c2f14649dc6cc8d33a9fb1469680a16ee40ba40fcb598e1
font_01_sfnt_off000072c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72C4 10228 bytes
SHA-256: 01d9c2be8f38a7a7711131e4f03078746f05402b971d98b5c2321bef9d74e121

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