Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c84e0b33153bee…

MALICIOUS

PDF

52.3 KB Created: 2020-08-22 19:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a090bda7cc7ca94f0a357d2fc0167160 SHA-1: 8336231918b0a1b34967b8cd6c04fb309b8af78a SHA-256: 78c84e0b33153beee977dcf3040ec6bde458cd5b1ef3a2ba0d40ce0778d63031
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious infrastructure, disguised as IELTS listening test answers. This is a common lure for phishing or malware distribution. The PDF also contains a large number of links to external PDFs, suggesting it is part of a link farm designed to manipulate search engine results for malicious purposes.

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+listening+test+2+book+9+answers In PDF document text
    • http://natomapo.chicagoforklift.com/uploads/1/3/0/8/130815009/198097.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/1/0436/0945/6803/files/brche_krzen_bungen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4564/8546/files/cyanogen_13_nexus_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2441/4882/files/mulojorezilakufuziluxopi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/cantilever_bridge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2200/0029/files/1122970508.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0812/2280/files/32070451740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/86473659439.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/7744924557.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8461/9681/files/26953109336.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_off00008e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8D 5376 bytes
SHA-256: e0dcce257ca736079279a073b003a3c4b4d4118b88aef74fa36b32682da3cb2b
font_01_sfnt_off0000a0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0EE 10536 bytes
SHA-256: ef28a9deee7abc0ad421fc3952478550f4cf187ee2f1d64f111c3c5c79798950

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