Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd8abd5ad5b2af5…

MALICIOUS

PDF

41.9 KB Created: 2020-08-21 00:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5841228fd07e5519f69019221109aa49 SHA-1: f9f89eea709381e33368da5758130160c48360a7 SHA-256: 8bd8abd5ad5b2af5b9b5e787a23c946f6d4f853d019390688f47e521d254d1ad
194 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure. The document body text, though partially corrupted, includes the URL 'https://ttraff.ru/pify?keyword=best+action+games+2019+android', which is presented as a lure related to 'best action games 2019 android'. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, many hosted on Shopify. The primary malicious IOC is the redirector URL, which likely leads to further 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=best+action+games+2019+android In PDF document text
    • http://files.bedfordpsychologists.com/uploads/1/3/1/4/131437504/jolabijapovarov.pdfIn PDF document text
    • http://wegokakig.improvisolab.com/uploads/1/3/1/4/131407197/9000c6e9c9.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/1/0436/3078/8758/files/71931029167.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/bimovovujitetez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/bacteriologa_clinica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0678/6725/files/dufirowibutefisivu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/86525235291.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/puvesukixobuzurujes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8699/3813/files/hepatocellular_carcinoma_surveillance_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1988/3928/files/91832430553.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/tozekabufataribog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0196/9820/files/74671869278.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9600/7065/files/87697919269.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9441/6290/files/hcu_adalah.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 4

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_off000064c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C5 5756 bytes
SHA-256: 5a17807aed8fc2c8c8f73d6c55fef6d6e04a40968d59e1d406e108e9a3788b29
font_01_sfnt_off00007842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7842 10212 bytes
SHA-256: 37992386426de7c6b4f84aa25a0fb917c6b492d10e37502cd5b73dc0ccf53d19

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