Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c5b8a654eb4847…

MALICIOUS

PDF

50.9 KB Created: 2020-08-12 05:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 02b5b0768ca7422849129f18c439f36b SHA-1: a893da4a9afc8a4cd2f391f7d132087ed616c36a SHA-256: a1c5b8a654eb484718ef98205959d7afd055d6d44e102d19e3255d8fd7b0c49d
194 Risk Score

Malware Insights

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

The PDF document is disguised as an English grammar book, but its primary function is to redirect users to malicious content. It contains a high number of external links, with one specifically identified as a malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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=practice+basic+english+grammar+book+1+pdf In PDF document text
    • http://files.toddpellandphotography.com/uploads/1/3/0/9/130969548/115791.pdfIn PDF document text
    • http://files.troutbum.ca/uploads/1/3/2/7/132710655/046c6686a.pdfIn PDF document text
    • http://files.walmsley.ch/uploads/1/3/1/4/131452935/8b776570448.pdfIn PDF document text
    • http://files.adirondackriverwalking.com/uploads/1/3/2/6/132682171/dadanosadudiruzilize.pdfIn PDF document text
    • http://files.oxfordmomsandtots.com/uploads/1/3/0/7/130739883/24b0f7.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/1/0435/4323/2661/files/21911937807.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1987/8048/files/fusionner_sur_une_page.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/wumalimeramopuxufewese.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/4390/0827/files/axial_and_centrifugal_compressor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65105912314.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/zidujesitixojusalefunisem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/0725/9302/files/jipidebisijef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/34860352950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4079/2999/files/bipesadokosideloz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0733/6867/files/universal_document_converter.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 8

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_off00007ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF4 5828 bytes
SHA-256: 0b2fa904ee56d7ab338265a46d15e17f889488847f8bc17c8ff07380af408c86
font_01_sfnt_off00009290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9290 13816 bytes
SHA-256: 911ab30faa35afe7410a187d76e3db40c297721c87a16923a3fc91a6d6954b4f

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