Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f9d6df344f0e1e…

MALICIOUS

PDF

46.7 KB Created: 2020-08-27 21:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 86a76cd66431be29440a6e208e18e3d3 SHA-1: 53944d03a0aefa41669fe08b5a83b5ffdabd209c SHA-256: 81f9d6df344f0e1eca38288129170663e59854ad0e72a4207a3deca63730e600
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially obfuscated, contains the URL 'https://ttraff.com/pify?keyword=libros+de+ingles+basico+para+leer' which is also flagged as a malicious redirector. This indicates a phishing attempt to redirect users to malicious content, likely for further exploitation or malware delivery.

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.com/pify?keyword=libros+de+ingles+basico+para+leer In PDF document text
    • http://nejodev.shadecreekwatershed.org/uploads/1/3/2/7/132740480/zagumusebawupudake.pdfIn PDF document text
    • http://files.lamodemagazine.net/uploads/1/3/0/7/130739238/6260092.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://cdn.shopify.com/s/files/1/0433/1634/7035/files/36897114462.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/college_application_letter_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3579/4327/files/6999699080.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/telogiduzijaseputidut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/33151208169.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3974/2369/files/genetic_algorithm_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/50938840955.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8381/7375/files/vupuxomomutupabejuzelabe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0889/0792/files/ritomaxenuzalesigegufaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3701/5719/files/sotipakopobe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6914 5032 bytes
SHA-256: c300f342f26c5c90c67edefb4075564db76bc54fc3a850b179c84b24d855c08b
font_01_sfnt_off00007a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A22 11240 bytes
SHA-256: 985c4033219ef8db9fb276449ecdba9acf486b3fbf293dba94e241eee285a6df
font_02_sfnt_off00009e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E8E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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