Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd72bb153b4071b…

MALICIOUS

PDF

44.4 KB Created: 2020-08-03 09:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5fb3b0b4addfba2507b79cb70cb8b0c1 SHA-1: 6cd5c6b14a3b4b4b67575f464446021893659680 SHA-256: 4bd72bb153b4071b40e9b353e4ba95ead5c1707131cec79946126c5f38b2a01d
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic firing indicates a malicious redirector link, specifically 'https://ttraff.ru/pify?keyword=conceptual+physics+12th+edition+pdf+free+download', which is designed to lure users into downloading potentially malicious content under the guise of a textbook. The document body, though heavily obfuscated, contains text related to 'conceptual physics 12th edition pdf free download', reinforcing the lure.

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=conceptual+physics+12th+edition+pdf+free+download In PDF document text
    • http://files.spectorlondon.com/uploads/1/3/1/0/131070362/7704417.pdfIn PDF document text
    • http://files.funkbusterbaits.com/uploads/1/3/0/7/130738919/wusogazobivonupa.pdfIn PDF document text
    • http://files.richmondavenueanimalhospital.com/uploads/1/3/0/8/130814676/9610654d01775ef.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/1/0429/3056/9382/files/28867254823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/dutevejobitomanudoken.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9597/3283/files/55934531215.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7105/2707/files/45386921736.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6479/5046/files/kekirolesexobu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5238/3904/files/charm_school_season_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4929/5770/files/89177695652.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3986/4485/files/voloxadevosidafox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/mimodej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7505/1413/files/wusunukadif.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_off00006de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE8 5528 bytes
SHA-256: c96cdf0d8ffc637aa3e6d8e138dd38200f7704325617778e446bc3b17188fd1f
font_01_sfnt_off000080c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C9 10660 bytes
SHA-256: 71e4a8c80d89351fc0c1a152371be5b854e21ef8fed74b70383bad3c989eca0e

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