Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8eeaf27d169b52…

MALICIOUS

PDF

40.3 KB Created: 2020-09-16 15:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6c5acea06e19311dd4dfaa2083832766 SHA-1: 6aee9b990dc94aea20de7740f8d111642e3dd7e9 SHA-256: 1b8eeaf27d169b52de138e6cafd170a3a55fe148c496dbb12dea4005388db8ee
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body text, though partially corrupted, includes the phrase 'The big sleep book free pdf' and the malicious URL, suggesting a lure for users to download content. The presence of a link farm heuristic further indicates an attempt to distribute malicious 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.me/wix?keyword=the+big+sleep+book+free+pdf In PDF document text
    • http://files.152811427883146431.com/uploads/1/3/0/8/130814926/ecf835.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9209/0784/files/vanirutigapij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetuvoveluganimuwejipas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1932/2022/files/povigalabumidijifunod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/vision_de_america_alejo_carpentier.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6139/3046/files/12961152515.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7217/5784/files/80302033766.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/lexedajunuwapafukumobugan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7953/1673/files/54585062164.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/3415618532.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8632/1566/files/tadajufipiwazej.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 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5469 4848 bytes
SHA-256: f26adcb7a394b4e549e69b5a91e54d416b03012b1cb6517c481e97655b0a3b4b
font_01_sfnt_off000064e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E9 9912 bytes
SHA-256: 81b70db7d86ed411a7c35c4703331cb1e6c96801f067958fc2bd6deb146af947
font_02_sfnt_off000086c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86C0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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