Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbc3260a182615f…

MALICIOUS

PDF

38.4 KB Created: 2020-08-21 19:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3869c6bd1f05d2d0079c3914c0c378a1 SHA-1: 389893d844d1080f4d20cb2014fdf5e73c7a6204 SHA-256: 4fbc3260a182615f9f21d79962f57b0ff774d26c08eb2a6b2d26aa3a736b2efc
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a medical certificate template. This redirector likely leads to a further malicious download or phishing page. The document body and embedded URLs reinforce the lure of a 'medical certificate ms word format'. The ML classifier 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.cc/pify?keyword=medical+certificate+ms+word+format In PDF document text
    • http://files.apparatusdancetheater.org/uploads/1/3/1/6/131607712/9941602.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/1/0437/7047/8746/files/winobodisafulejiwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5122/1143/files/rasamirudowukipabajer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/4199367750.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1938/5502/files/driver_adb_vivo_y81.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/kaposi_sarcoma_and_hiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/vafenexuletaveberajib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/nazaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/28952517706.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7899/1513/files/anatomia_de_la_piel_y_anexos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8900/2653/files/58258272292.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3469/6097/files/candy_crush_soda_saga_mod_apk_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/install_python_ubuntu.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 1

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_off000059e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59E9 5264 bytes
SHA-256: 3d865ca63ca8a9542d9fadda8165b4b90d71434d005b599c8a31bb8fb30e921f
font_01_sfnt_off00006bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC9 9684 bytes
SHA-256: f5b109267921a6edd3c2980e7da954888f9129b1ec44c906d76763762536bb26

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