Malicious PDF — malware analysis report

Static analysis result for SHA-256 933c3513c995d8e9…

MALICIOUS

PDF

64.7 KB Created: 2020-10-09 02:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b3b28539a2144158fd7076ad7ea4b978 SHA-1: 213a92215e42136bb218da3f522392714d9f507b SHA-256: 933c3513c995d8e921e516297d53a6965b0ce3c01e73e0d3701a5e9302e42cdc
132 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'ttraff.com'. The document's structure and numerous links to disposable hosting suggest a link farm designed to obscure the final destination, likely a phishing page or malware download. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=cerritos+center+for+the+performing+arts+parking In PDF document text
    • https://site-1043283.mozfiles.com/files/1043283/71448464212.pdfIn PDF document text
    • https://site-1036680.mozfiles.com/files/1036680/likejibubutejinibidunadug.pdfIn PDF document text
    • https://site-1042666.mozfiles.com/files/1042666/lutadomenijepiwibazisaw.pdfIn PDF document text
    • https://site-1039491.mozfiles.com/files/1039491/12433898367.pdfIn PDF document text
    • https://site-1039528.mozfiles.com/files/1039528/53355496534.pdfIn PDF document text
    • https://site-1040885.mozfiles.com/files/1040885/lavexajag.pdfIn PDF document text
    • https://site-1036743.mozfiles.com/files/1036743/betufuvupidakefozove.pdfIn PDF document text
    • https://site-1036721.mozfiles.com/files/1036721/kexunoxani.pdfIn PDF document text
    • https://site-1038815.mozfiles.com/files/1038815/wikadizofimagof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1162d4dc-1550-4ede-b1bf-ffcae0297482/72843802426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ed5446-193b-41da-b771-0eaf8a6ad192/46653598049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01fe8653-77c0-44cd-af22-5b060511a1e9/312276240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574631ff-f685-4419-b4a8-fb21f8b42527/12248898087.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_off0000a3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3F6 5272 bytes
SHA-256: 9ae1d1d6a269af51c215a974dd39e653deac6227017833ca167d342dd99aff2e
font_01_sfnt_off0000b5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B6 16004 bytes
SHA-256: c711cdd91b5cdb1b62dac1d05470ec0dde7e3c1c43568b02c1acc6864941394e
font_02_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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