Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cd4981fb0c7b76…

MALICIOUS

PDF

35.5 KB Created: 2020-08-09 06:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b7d0b5934302ff53c770dc8778297353 SHA-1: 9b94f3dc71368aadffd0a053da4a833ed977e172 SHA-256: d2cd4981fb0c7b76c16a0cfaa07f1bb39bdc3999cb4ed44597edaf90d46a0a06
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'anatomy handouts pdf' and a large farm of external PDF links, likely to manipulate search engine results or distribute malware. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack.

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/pify?keyword=anatomy+handouts+pdf In PDF document text
    • http://files.yaldocargo.com/uploads/1/3/1/3/131382387/rokozazelogu_tozoto_xatugipewikat_vibanejid.pdfIn PDF document text
    • http://files.emilyeichmeier.com/uploads/1/3/1/3/131378918/rawutisobip-vegoso.pdfIn PDF document text
    • http://files.camanchemobilehomeparks.com/uploads/1/3/1/3/131384145/fefizojepopubatidake.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/1/0431/5856/9128/files/55183265124.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/potulebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/zerebuvagenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0937/5383/files/63917720106.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/36906747059.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/1057/5771/files/ad_d_chronomancer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/alcohol_phenol_and_ether_ncert_solution_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5426/0633/files/gungeon_bubble_blaster.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6590/8123/files/75303143844.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/90510547140.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/vernier_caliper_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/work_smarter_not_harder_book_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/baidu_map_api.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_off00004e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E33 5244 bytes
SHA-256: 29ea35ea39c37920a03a2994150716e69c6c626e895fd96d2e55aba9157cfeba
font_01_sfnt_off00005ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF4 9852 bytes
SHA-256: 4fd0b5d574215d5591e6e805615cb28e27634b7f7c7497c8267922783004b712

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