Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c5a21bba652c19…

MALICIOUS

PDF

35.7 KB Created: 2020-08-26 18:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 640b4ea93f3969b6ab0233f60428107c SHA-1: 799515ecc90b5032aebb47ecd15fa9c0a37bbabc SHA-256: a6c5a21bba652c199b57938d0a8a032c8ec5ba0c25ecd5a591d2d087a58ce43a
234 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 a redirector service. The primary heuristic indicates that these links lead to known malicious infrastructure. The document body itself is largely unreadable but contains a URL that matches the malicious redirector. This suggests the document's purpose is to lure users into clicking malicious links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=texto+o+anivers%25C3%25A1rio+do+seu+alfabeto+para+imprimir In PDF document text
    • http://files.michaeljamesoberhauser.com/uploads/1/3/0/7/130739616/3660701.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/1/0433/0687/7080/files/jaxigosileworu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/6921/8454/files/diocese_of_pittsburgh_curriculum_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8022/8759/files/az_mvd_revocation_packet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/korean_learning_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/darisokezujowekaxapupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2315/4850/files/vidmate_movie_er_for_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/kijolevufetidoki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/curriculum_vitae_format_kenya.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0812/3303/files/gopurevemi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4778/8450/files/gaxolilarobefesikokade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3835/0231/files/lafisodojotobuwawil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/kemiwekak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/daxitojadedeluwagedu.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_off00004aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAD 5640 bytes
SHA-256: 7121d46306a6bb9c5a687f5d579d07d04ddeece322e1bb92b78683051aad0e76
font_01_sfnt_off00005d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D36 10952 bytes
SHA-256: 9cd99d7f89f3a6359f56beec34cdcada1dff6555a3a2504750dad40492aff378

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