Malicious PDF — malware analysis report

Static analysis result for SHA-256 171f86be03c864f5…

MALICIOUS

PDF

39.7 KB Created: 2020-11-09 03:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6644f9f8ff50b2e4db05758555193459 SHA-1: 1e730cb80d7693ad2394bae4e512d3a3a8b86f0a SHA-256: 171f86be03c864f5ba3560f1045bc4c0cc38fbefae0bc538dd27dca39a583642
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs and text that mimic a download link for 'Undertale apk download kindle', directing users to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the document structure suggests it's a link farm designed to funnel users to potentially harmful content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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://traffine.ru/123?keyword=undertale+apk+download+kindle In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416510/normal_5f9f8bbae778d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5fa8751b2c704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_5f9a2404e9fec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_5f8d910ed2960.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/ambientico_una_ac_crs_ambientales.pdfIn PDF document text
    • https://vusesalo.files.wordpress.com/2020/11/jifaravebivulimu.pdfIn PDF document text
    • https://romixoma.files.wordpress.com/2020/11/town_and_country_planning_act_1990.pdfIn PDF document text
    • https://tarakuluraxe.files.wordpress.com/2020/11/invitations_to_science_inquiry.pdfIn PDF document text
    • https://jubiligaduj.files.wordpress.com/2020/11/7962369317.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/93172207278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb871f2-440b-4d6e-a4f4-e78a3bb0d5f7/worx_chainsaw_owners_manual.pdfIn PDF document text
    • https://bofasigel.files.wordpress.com/2020/11/7615110541.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_off00005430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5430 4920 bytes
SHA-256: c55c0640658af6fd84407a49712dafb017f3a034291292409ad58be2ec48da92
font_01_sfnt_off00006508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6508 2140 bytes
SHA-256: 49dddaa543544930169c80d10742cf71a10a90771d945bdf421e53748b1fa594
font_02_sfnt_off00006ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE1 9748 bytes
SHA-256: 8ca6894df5831b0c4fc473fc1659626a2bae5cbab5533b3f5584b3d2d4314bb6

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