Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d207c9499374ca…

MALICIOUS

PDF

47.9 KB Created: 2020-08-17 12:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 74e4c03d053d64af863a42ae1d8cfad9 SHA-1: dc3ed399193f613e240cd18301c31d9f6fc8fb83 SHA-256: 91d207c9499374ca4add8c254e421aefe0c9f8c0382a382a4a33affc5e01a556
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a "download" button lure and multiple embedded links, including one pointing to a known malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=4-+6+practice+inverse+trigonometric+functions+worksheet, which likely serves as a gateway to further malicious content. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on Shopify, suggesting a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=4-+6+practice+inverse+trigonometric+functions+worksheet In PDF document text
    • http://files.cocurricular.org/uploads/1/3/0/7/130738984/devasigarux.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/1/0428/1758/5308/files/xovepubududaxud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1682/2679/files/17962916213.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7238/8249/files/70818604189.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/78305727276.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88020392138.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/butifalewikofozi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4102/9276/files/fifolusuvozeporujibebexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5469/3529/files/i_love_money.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_off00006d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D11 5792 bytes
SHA-256: 84c5c7f25cd80c7d84adfaeb2f178a711c2877f2c08b692e66c7ad08fbf6c20c
font_01_sfnt_off000080b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80B8 16196 bytes
SHA-256: f7f54d7955253ddeef07fd226159f807eb2ac6744a216e852d6fc88b8b833eaf

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