Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f81a808a03b169e…

MALICIOUS

PDF

34.9 KB Created: 2020-08-19 00:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 86665edb1600827c40348e8f999a8b2e SHA-1: b934480082ef1201cd1be554b67ae731d50e0eb3 SHA-256: 7f81a808a03b169e2e37a2c2d9df0b2cb1d3937b42cf874c1698725edaedf862
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK. The embedded URL 'https://ttraff.ru/pify?keyword=relative+and+interrogative+pronouns+worksheets+pdf' is a primary indicator of this malicious redirection. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to a potentially harmful site, likely for phishing or malware distribution.

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/pify?keyword=relative+and+interrogative+pronouns+worksheets+pdf In PDF document text
    • http://files.allstarsandbestsellers.info/uploads/1/3/1/1/131163959/55188.pdfIn PDF document text
    • http://files.joeramoni.com/uploads/1/3/1/3/131379801/07468c.pdfIn PDF document text
    • http://files.littlegreenjeep.com/uploads/1/3/0/7/130739744/5467582.pdfIn PDF document text
    • http://vuzapif.brightdoxies.com/uploads/1/3/1/4/131453453/3c387a.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/1/0429/3941/6732/files/famadaburijod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0281/4876/files/excel_learning_in_bengali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1682/2679/files/48321942823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/jizolagerogaguwujeral.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5530/7159/files/40835326243.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/67371924380.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/4292/5726/files/cancel_la_fitness_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5611/1520/files/affidavit_template_for_lost_id_south_africa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42262915950.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_off00004898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4898 5528 bytes
SHA-256: 2b817ec98005383a2492fc6a6e74bc90b086d3f212110a3ffe76610e93040e41
font_01_sfnt_off00005b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7A 11020 bytes
SHA-256: 598c6e2a3c8b523591783806fece7e31ae5d64b87006f2f479970cfefce9cade

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