Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c403a591c8f733…

MALICIOUS

PDF

35.3 KB Created: 2020-08-18 22:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 625d3f9dbf17eb1772a43c776846c50d SHA-1: 2f69ce47d94efa428580e32ec7b8852f215b2e99 SHA-256: 05c403a591c8f733969d264b76f519968c33701cab8a8b5c88cdbccf453334e2
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a game guide, but it redirects to a malicious URL. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's part of an SEO-based phishing campaign. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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=world+of+warships+destroyer+guide+2019 In PDF document text
    • http://files.hoodstax.com/uploads/1/3/0/7/130775413/2816b.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/1/0429/7372/4825/files/88616697859.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8792/8223/files/bella_y_la_bestia_cuento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/11177656797.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0380/5847/files/je_me_dbrouille_en_anglais_livre_gratuit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0493/4818/files/zoxexu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/fodate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6942/3257/files/apache_cassandra_upgrade_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/69374153308.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1282/3967/files/fomabovuvimupatamasol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/nilumagipuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/back_to_school_activities_for_high_school_students.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 1

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_off00004931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4931 5992 bytes
SHA-256: 58a8f7d846877c097eefa10a9f08c96c04dbd247893c0da27872cae3e88cd346
font_01_sfnt_off00005dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBB 10204 bytes
SHA-256: 4004f49a38489131dda9c21bfc1872baa1931981df508d269e68a97d6f38c2f7

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