Malicious PDF — malware analysis report

Static analysis result for SHA-256 687c0beba45b2545…

MALICIOUS

PDF

32.2 KB Created: 2020-08-15 03:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 65a92817f1812a0a6f81cd9da3d94c6c SHA-1: db1305d7e54ff0a124f8e9c401b6bfed5ddeb7d0 SHA-256: 687c0beba45b25458521c6a1e7a9683874123bfcbd2005170aea10991c381e8f
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a redirector service, which in turn points to a "free download" lure. The primary redirector URL is https://ttraff.ru/pify?keyword=simple+past+mixed+exercises+with+answers. The document's structure and the presence of numerous external links suggest it is part of a link farm designed to drive traffic to malicious or deceptive content. The ML classifier also strongly flagged this PDF as malicious.

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=simple+past+mixed+exercises+with+answers In PDF document text
    • http://files.parentsoftransgenderkids.org/uploads/1/3/0/8/130814553/zabilix_riwigas_wovetok.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/1/0429/1775/7095/files/complements_in_binary_number_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2687/3509/files/catalogue_n_philips_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7645/9422/files/63216517328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4030/9402/files/1586790957.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/pugojor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3917/6342/files/easy-_webprint_ex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5414/5444/files/week_in_a_year.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6112/5025/files/10177498691.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/76077107679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0054/4931/files/6055268703.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 2

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_off00003f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F45 5576 bytes
SHA-256: fcc5b54b54f5fc9bbfebc11cf80f8c14cbe4ce52d022f3ebf04cb7364cc47e3b
font_01_sfnt_off00005220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5220 9968 bytes
SHA-256: cbef4a9288e14de15f5b058d22ce7ed5a7890327d97dc4f55caf8ee0c7e6bd04

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