Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ae97df4c385b2c…

MALICIOUS

PDF

34.2 KB Created: 2020-11-07 02:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 63f86639cddfbebc360c3770851ffb64 SHA-1: df7762f579e7af542eacaee4e5b1d5a90538a881 SHA-256: b4ae97df4c385b2c911723e2e28308b9c430f211657fb76bb1f508405a390245
84 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document uses a lure related to downloading the game 'Strike Force Heroes 3', presenting a fake download button and call-to-action text. It contains an embedded URI that redirects to a malicious URL, likely to download a second-stage payload. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?keyword=strike+force+3+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393637/normal_5f9fc1906cbd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00004752.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00004752.bin)
    • https://s3.amazonaws.com/rekawexuretowo/gw2_artificer_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5ab52e-a162-452f-9cec-7c3d815849bb/agencias_de_viajes_virtuales_ventajas_y_desventajas.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/lixur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3a74df-b753-46ce-a9ea-ded0c8830ec4/pazudukogiw.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/bulovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df654a8-0b01-4644-8fe4-1a896e36b4f9/ser_o_estar_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/86635763155.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/rinutulomipevivomugupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/458982d6-906a-4ab3-a8b1-b48a89164aa4/rozinakekana.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/c_spire_phones_for_sell.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 extracted file (font_00_sfnt_off00004752.bin)

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_off00004752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4752 5260 bytes
SHA-256: 8f9e510fccc52d80aa7d0f9fff2ce8664a576d655d5ce2d03930211ed5946b59
font_01_sfnt_off00005960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5960 10256 bytes
SHA-256: 14848bdc56dd71c7dee5b3524aa40fe57f14cc27a0559eaa2ee8e02cad265ad7

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