Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f294054925c71b…

MALICIOUS

PDF

36.4 KB Created: 2020-08-14 04:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e6f625afc33c24787579988654d3cf01 SHA-1: cfb3983ee8747e7df07be855bd8972254d988c04 SHA-256: 16f294054925c71bb0f141513c455af195211917dabd869318c5632b1232b70f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM. The primary redirector URL, https://ttraff.ru/wb?keyword=openclassroom%20pdf%20php, is repeatedly referenced, indicating an attempt to lure users to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.
  • 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.
  • 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=openclassroom%20pdf%20php In PDF document text
    • http://sinovofeb.bentail.com/uploads/1/3/0/7/130775379/1020415.pdfIn PDF document text
    • http://files.chrislilly.tv/uploads/1/3/0/8/130814078/1329bc08151883c.pdfIn PDF document text
    • http://files.etegl.org/uploads/1/3/1/1/131164574/604551.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/1/0431/1059/6765/files/57282297096.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/83656553473.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/kativuzokeritatoxigisibu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9232/9119/files/64449689855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/ruxurelaza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/3494/7233/files/fitbit_hr_charge_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/equipped_for_reading_success_david_kilpatrick.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8422/6453/files/lejepegutezaxumabojokimir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5103/0430/files/discuss_the_capital_structure_theory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/birimot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2201/4871/files/8714698555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2403/0619/files/dejejuzakusebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4897/6027/files/bodurojujovanutowonitu.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 6

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_off00004e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E5D 5424 bytes
SHA-256: bfea43de20f07f0fed47b33b1fd9ac24f902366187d9a4cad4feec7ebdd79e2b
font_01_sfnt_off00006094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6094 10728 bytes
SHA-256: 64262244edea1403935203c36a51881c82f1c67ff8269644b79ef05bc37a2aa9

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