Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81a24ae1840b724…

MALICIOUS

PDF

49.5 KB Created: 2020-08-25 23:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a5c0593c90e7a1d5fa09ee508b629382 SHA-1: 5e4df39f58132a21cf2efb5687d1309e490e128c SHA-256: e81a24ae1840b7247fb7bd94c38189e409169cd805e0d1e1f1802685ae31ced4
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings. The primary attack pattern involves luring users to external malicious sites.

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=tiyatro+metni+nas%25C4%25B1l+yaz%25C4%25B1l%25C4%25B1r In PDF document text
    • http://sugexez.openthedoorleadership.com/uploads/1/3/1/4/131453558/dadixexoxovore_zezax_zigitetob.pdfIn PDF document text
    • http://files.carpetcleaningaffordable.com/uploads/1/3/0/8/130814208/digusedozim.pdfIn PDF document text
    • http://talus.paganscrapbooksupply.com/uploads/1/3/0/8/130874153/091429.pdfIn PDF document text
    • http://dojuga.campweempower.net/uploads/1/3/0/7/130775166/delerikotanemevagef.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/1/0433/6871/0309/files/diziler_matematik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7166/7360/files/autumn_leaves_piano_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/tujugorejonuweruvofakug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8955/1770/files/avast_free_crackeado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9884/7894/files/kimuzigilavomak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7670/4664/files/nixifitunexafizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/quartz_crystal_thickness_monitor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6769/4490/files/adaptation_imdb_parents_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8871/5682/files/anxiolytics_davis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7827/1641/files/tarobekivakizisugago.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/the_guide_handbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/rinuguxu.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_off00008125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8125 4964 bytes
SHA-256: dd0c15c99586bccc1a6a2cc842acccd7d5e578e9e60444b28dcc0159ffd8348c
font_01_sfnt_off000091fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91FA 12140 bytes
SHA-256: 77d07be66cf057eb01ccada72dad34ecf5b267e7836979f07b9807890b883950

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