Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ce1dba7c1449da…

MALICIOUS

PDF

38.7 KB Created: 2020-08-12 06:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 51fddb632a9f00cd1941a2f0f8acd40e SHA-1: 92104a5aae4e8da9e48800cb9c5f12a4a0fe5229 SHA-256: 81ce1dba7c1449dafd27aa2c84a44833934b975c56dee4056eecf7b591e733e0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to a known malicious redirector, disguised as a free CCNA textbook download. The ML classifier strongly indicated maliciousness, and the presence of a redirector link suggests an attempt to lead the user to a malicious site or download. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

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.cc/wb?keyword=ccna%20textbook%20free%20download%20pdf In PDF document text
    • http://files.ebrightfoundation.org/uploads/1/3/1/3/131398366/3417868.pdfIn PDF document text
    • http://files.londonslings.com/uploads/1/3/0/8/130873902/vagunonikejoxa.pdfIn PDF document text
    • http://rowizilad.buildabow.ca/uploads/1/3/1/6/131607062/xejes_xafikeloxojegil_linote.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/1/0433/7578/8184/files/vomozafexivumidixaxaxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5619/3955/files/60832510512.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/95979370616.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4434/7802/files/16586610063.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6078/1475/files/form_130_u.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2893/7880/files/how_to_send_videos_on_discord.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8547/7541/files/libasazufokadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9632/4758/files/99012759519.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6305/8340/files/addictive_thinking_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/tomojarofokuta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/giwetapa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6732/6112/files/marathi_barakhadi_free_download.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 1

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_off00004f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F23 5240 bytes
SHA-256: 73d6230b12d8a364f18db7fb392c6665ad2f3e3a64d4fbfffbfc8038bd75450a
font_01_sfnt_off0000610f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x610F 19272 bytes
SHA-256: 895ec0178e42085fad14190ae16fd63aaffc56d0f65995d3c3a6e2e609231d53

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