Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf8429b7f3c4b0e…

MALICIOUS

PDF

37.3 KB Created: 2020-08-13 21:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0402fd5deb57cc0f82c3faf35a6af5a5 SHA-1: ff0cf571c821a35e09202bfca64358f6069e0ce6 SHA-256: 7bf8429b7f3c4b0e5cd97dfe1159aa7d409df4f415358451bce959f3360fe8d5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, contains text suggesting it is a lure for educational materials, likely to trick users into clicking the malicious links. The presence of a link farm and redirector indicates an attempt to drive traffic to potentially malicious content.

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=exponents+and+logarithms+worksheet+honors+precalculus In PDF document text
    • http://files.zgatl.org/uploads/1/3/1/8/131857465/a8db9f09446.pdfIn PDF document text
    • http://files.c3pojhmi.com/uploads/1/3/2/3/132302916/rukunimavevowab-kilawemalijitir-rupulatelonu.pdfIn PDF document text
    • http://files.davidcmahlercomics.com/uploads/1/3/1/4/131454255/72cbdf1b447a5.pdfIn PDF document text
    • http://files.futura-foundation.co.uk/uploads/1/3/2/6/132695575/toberasenasasiwu.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/1/0436/0290/3202/files/kejobufupil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/85975266787.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3747/2421/files/python_object_oriented_programming_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dogazuzotefoninu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/26125621574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0110/9920/files/nekejazezavaruvinos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0756/6239/files/destinos_fatales_andres_caicedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/bollinger_bands_settings_for_scalping.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8341/5204/files/nafapesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5407/8871/files/making_love_out_of_nothing_at_all_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/1942989525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/item_id_minecraft_pe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/wisiwovukogelupobarawap.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 5

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_off00004fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA1 5668 bytes
SHA-256: 587ce101144323daecc6c1df9cfacde2fe2cd8146fee3af679113f04633980be
font_01_sfnt_off000062d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D0 10216 bytes
SHA-256: b2ec34cd5f7d10f53f29c61e4d9335786dab9b5f1e0a10f6591a8a473de2e969

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