Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f876c18910d3d5…

MALICIOUS

PDF

46.8 KB Created: 2020-08-12 21:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e37f73f846da683ce388bfa80820ffdd SHA-1: f2b350b16a25fc5178d803e1412221e4fd40a942 SHA-256: 25f876c18910d3d5dc065c6630bc02f7d858c9ed478e78a201671480bf4e16fb
234 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a fake CAPTCHA prompt, a common social engineering tactic to trick users into interacting with malicious content. It also includes numerous links, with one pointing to a known malicious redirector at 'ttraff.ru'. This redirector is likely used to funnel victims to further malicious sites or downloads. The document body itself is heavily obfuscated but contains the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.ru/wb?keyword=network%20support%20engineer%20interview%20questions%20and%20answers%20pdf In PDF document text
    • http://zivotin.uppergroundproduction.com/uploads/1/3/1/6/131607131/taxadegimosir.pdfIn PDF document text
    • http://bobonekim.handmadeden.com/uploads/1/3/1/8/131871674/sesiledume.pdfIn PDF document text
    • http://nufijex.dallasapwu.org/uploads/1/3/0/7/130775923/2707809.pdfIn PDF document text
    • http://files.hypopara-awarenessday.com/uploads/1/3/1/6/131606262/2a9e2a3b931c1a4.pdfIn PDF document text
    • http://vuxow.naughtynaturepodcast.com/uploads/1/3/1/4/131407005/rekovaga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5935/4517/files/how_to_make_utorrent_downloads_faster.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fesulemenakasisot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9141/8526/files/mojusudufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0670/5316/files/xunademekuvomadaratef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/todexufisedojotijejezaxir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1674/1286/files/mumivovopaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4214/4407/files/jineworuvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5528/3350/files/diwutigodifitadoxos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/gepuwafikotosibemi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1600/9374/files/application_letter_for_information_technology_graduate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/7334/3383/files/interim_budget_highlights.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000781e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x781E 5488 bytes
SHA-256: c21315913a71e042359fd6f47191e2e998252b3d8e724b21409baeab021395a0
font_01_sfnt_off00008b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B00 10252 bytes
SHA-256: 8767bc8d8901bb22872b5e43177a2b81952ce844750fa455800d78150a7399d5

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