Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef860a849383013e…

MALICIOUS

PDF

40.9 KB Created: 2020-08-14 01:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4828553fdcbd6e04c0243fbdc9a42f75 SHA-1: 76800760114d0f34969232e73b2bab3f9d8a645d SHA-256: ef860a849383013e9b314b11b8874a44821aedc8ca8c7b5045736cee95415532
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 domains commonly used in SEO link farms. One critical heuristic identified a link to a known malicious redirector. The document body itself is heavily obfuscated but contains the URL of the redirector and several other URLs, some of which are benign but others are unknown or potentially malicious. The primary attack pattern appears to be directing users to malicious infrastructure through these embedded links.

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/wb?keyword=transtorno%20de%20personalidade%20evitativa%20pdf In PDF document text
    • http://files.kittlesmusicstore.com/uploads/1/3/1/4/131406785/7890823.pdfIn PDF document text
    • http://dixul.chidoscleaners.com/uploads/1/3/2/7/132710621/fepovakutez.pdfIn PDF document text
    • http://nolojopup.cuib.eu/uploads/1/3/2/7/132712615/tizufexonefupu.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/1/0437/5222/6974/files/xinekezidibuza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/rojewediza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8766/7104/files/wunivutalelavafosetos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0722/0635/files/wipowotajafo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2938/0767/files/canara_bank_credit_card_statement_password_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3926/8774/files/aneurisma_de_aorta_torcica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9547/3822/files/kanajako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70282461387.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2670/8637/files/52403953756.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8133/4935/files/eggs_benedict_nutrition_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/fefezemowapujitalixixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0772/0093/files/javexutonipexaravisinajox.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_off00005fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD6 5044 bytes
SHA-256: 35dc372eb97642a1419fc6eda8db984223a2fcfc91c569140a7967f3dd59da31
font_01_sfnt_off0000710f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x710F 10988 bytes
SHA-256: fa30e62a5d6262a8a322bdd3fb8d07d776aa3330e583810dd13795d0b1d6bd78

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