Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd503f518fbad9d…

MALICIOUS

PDF

38.8 KB Created: 2020-08-14 11:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 34e1d4c9ede8bb3a86d83a52627397a3 SHA-1: 6533b116004fdb5b3fad0fdaf381f000e7733b58 SHA-256: ecd503f518fbad9d8184226701ac605cbc8f4d613af22c20090fc6460fdc3990
202 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, pointing to 'https://ttraff.ru/pify?keyword=100+approximation+questions+pdf'. Additionally, the 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, suggesting a tactic to distribute malicious content or manipulate search engine results. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern. No scripts were extracted, and the document body is heavily obfuscated, but the link analysis is sufficient to determine the malicious intent.

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=100+approximation+questions+pdf In PDF document text
    • http://files.smithandsonlandscapes.com/uploads/1/3/0/7/130776401/kulujoxaburuno.pdfIn PDF document text
    • http://files.kaimalamarina.org/uploads/1/3/0/9/130969300/letimir.pdfIn PDF document text
    • http://files.rawseries.org/uploads/1/3/1/6/131606605/9964294.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/1/0433/0687/7080/files/kiragin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/tapeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4641/1160/files/the_story_of_my_life_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/bridging_the_gap_13th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8051/5745/files/33069416250.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7195/3301/files/pasuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0389/6230/files/jozuxaxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/kutogog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31931154882.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6150/1349/files/mathematical_methods_for_physicists_arfken.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
🗂 Part of campaign: soap-architects.com 7 samples

Related samples 7

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_off000058f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58F3 5448 bytes
SHA-256: d941e4e0d9d64e73b34d779968633e6492227e31ba3291511831666c6a5d9bd4
font_01_sfnt_off00006b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5C 10360 bytes
SHA-256: 7a339b6b12bf303f1b92a1b5b97bc0444607730e18227eaca750cb617983514f

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