Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d8fa0d76a70c79…

MALICIOUS

PDF

37.6 KB Created: 2020-08-14 15:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: aa25cad7db522cf4c137706212f288e7 SHA-1: 0e0a619f54dc2fc2aa6f2e45ca6e0c30833c5e7b SHA-256: a2d8fa0d76a70c797d6beea187dd00415acd70784b3c964e32f19b00ad6c14e0
194 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains a significant number of embedded links, many pointing to external PDF files. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=alsager+school+6th+form', suggesting a lure related to 'alsager school 6th form'. The presence of numerous Shopify links, while many are benign, contributes to the overall link farm characteristic.

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/pify?keyword=alsager+school+6th+form In PDF document text
    • http://files.jordangirardin.com/uploads/1/3/0/7/130776037/1d84114.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/1/0434/1609/2828/files/cape_biology_syllabus_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gekubamunanapomokavonata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/97636386638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/51827394317.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/4159/0170/files/amours_solitaires.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/2639624701.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9938/1146/files/classroom_objects_coloring_pages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/99883959749.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/90562155005.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wifufokamavobopizevotug.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_off00005503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5503 5440 bytes
SHA-256: 1f440f5b453736408c81c24b2caf7c1c629ea398387cd8f13a6e90c99c9cede5
font_01_sfnt_off0000675c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675C 10236 bytes
SHA-256: 7bea5afefc8a25e0129f43290668d01f472f774d7915d53867a5f8e33bc50536

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