Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7953773142c776…

MALICIOUS

PDF

41.0 KB Created: 2020-08-09 13:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7a5e539edcd30ecf2b4b45a948a61e44 SHA-1: 1a4d156679e84eefe1f0b5eceb85c972175665d9 SHA-256: 7c7953773142c7764aacaa830a5a4ee97ed7a2e3f47a18d87abde9bb33cdef7e
194 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of a phishing lure for a 'free worksheet'. The ML classifier strongly indicates maliciousness, and the link farm heuristic suggests an attempt to manipulate search engine results for phishing purposes.

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=all+about+me+worksheet+free+pdf In PDF document text
    • http://files.dryer-vent-doctor.com/uploads/1/3/0/7/130739062/3073871.pdfIn PDF document text
    • http://files.huningtonchase.org/uploads/1/3/0/7/130739287/buxefaponibakaw.pdfIn PDF document text
    • http://files.consultorianora.com/uploads/1/3/1/3/131380295/7609107.pdfIn PDF document text
    • http://sataxaw.ancientwavestudios.com/uploads/1/3/1/0/131070109/rifulawelegok-xagixaj-rabis-nanazu.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/1/0428/7656/7711/files/zujoditedapokasivujipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mipubafuminidumef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/how_to_indent_on_google_docs_app.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2813/5591/files/ashcroft_mermin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/10250399145.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2679/2093/files/72230016638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/xudowipuju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/67875895852.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/gisidegupujawijubaviguga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0898/1152/files/biboguj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9919/2486/files/75804779536.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/maths_worksheets_for_year_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0158/5569/files/create_marksheet_in_excel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/69924800537.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 4

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_off00006224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6224 5568 bytes
SHA-256: e085cc4dc7dbbf1b54e0947b9baacfd1d42e6fb667a772d8b7b54490c893c9b7
font_01_sfnt_off000074f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74F0 9888 bytes
SHA-256: 5da98d3dadde35d0129237b27bd9105f82c919efae0992fa933102876c5b6f68

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