Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83ec45661ae7a7e…

MALICIOUS

PDF

45.6 KB Created: 2020-08-14 04:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c53f0fb960258bc325b9f84c15e3aa4c SHA-1: ad73be130338760d3961ba8a76d6dbd91a7e6c70 SHA-256: c83ec45661ae7a7e895d78c18c4ebb6b0f7d61e2f2e76c05241802fe249cb6f6
194 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure, specifically 'ttraff.com', which is used in conjunction with the search term 'ielts reading practice test with answers 2019'. The document also exhibits characteristics of a PDF link farm, with many links pointing to various domains, including several on 'cdn.shopify.com' and other suspicious domains. The primary intent appears to be directing users to malicious or potentially unwanted content through this link farm.

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.com/pify?keyword=ielts+reading+practice+test+with+answers+2019 In PDF document text
    • http://busamamol.blinkstaging.com/uploads/1/3/2/7/132710507/xogafagojifig.pdfIn PDF document text
    • http://files.camarillospringsseniorgolf.com/uploads/1/3/1/3/131378838/4160644.pdfIn PDF document text
    • http://files.claytonpharm.com/uploads/1/3/0/7/130775306/vujulakavaxuperaje.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/1/0428/3308/4575/files/unmerited_favor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4415/0165/files/30330707341.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4396/1504/files/zikekal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/kugepejunifon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/77370042063.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7625/5897/files/sovogi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3053/6614/files/gta_5_ps4_cheat_codes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/72302619497.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/jixewutaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0957/8904/files/2005_vw_beetle_owners_manual_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/lagivefesumo.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_off0000724b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x724B 5848 bytes
SHA-256: f6605c65124acdad72d2e74ee4be2747683709fa8157097b6c5c2a08c32dddd4
font_01_sfnt_off00008636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8636 10352 bytes
SHA-256: 2e73f07de1ec6f433da104cb64df8041757a2cf82147532d1607708030edb73d

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