Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa87d2dd3e9b881…

MALICIOUS

PDF

46.8 KB Created: 2020-10-15 16:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: bf6b31934826b499a95d2fbaffcf01db SHA-1: 905f98dbca6c6709a50f40b12b6679013fb10371 SHA-256: 4fa87d2dd3e9b881dd5a0e0590f127f3a4f0afed1cbf1a99ac57baff9b00427c
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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
  • 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://ggtraff.ru/123?keyword=convert+pdf+to+ppt+i+love In PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/duzil-gopusa.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/fisufo-dozadagozezanaj-kunijozegok.pdfIn PDF document text
    • https://waniremupamed.weebly.com/uploads/1/3/1/4/131407535/84df86015984.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/lefiwakiwani-mowatumemozek-vepobanejez-nugito.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/palaj_xofepevez.pdfIn PDF document text
    • https://site-1039852.mozfiles.com/files/1039852/mofilurodidimikemaxo.pdfIn PDF document text
    • https://site-1039641.mozfiles.com/files/1039641/8682877670.pdfIn PDF document text
    • https://site-1042510.mozfiles.com/files/1042510/67857164880.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/1/0499/1333/1870/files/playstation_error_code_8002a33f.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7647/7632/files/roblox_unlimited_robux_apk_download_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9889/0147/files/razors_edge_pitbull.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e649ec4b-cc2f-4c4f-8578-aee0d4306c79/pamolofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27f7e2e-6181-4546-b51c-16cb94c8aa32/lisabeluzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ae6bc9-9b7e-448e-a0c4-a44b1cda833f/jatetum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f8a37d-8a1a-4297-99e8-e9533a2169d4/rejopuserebovo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1542/1083/files/sepov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3137/8592/files/77190874827.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2006/6209/files/carta_encclica_redemptoris_mater.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1370/1283/files/74733853358.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7035/7149/files/october_sky_movie_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D0 4612 bytes
SHA-256: 1228a14618d34cb82c29d7abc0188cf77b85fb029ec53bd653cbd421c84d8836
font_01_sfnt_off00007491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7491 9928 bytes
SHA-256: 9d5c8b4fcb878281ed2dbee8914b499a6c58f09959501b3471137ca047065411
font_02_sfnt_off0000967c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x967C 16632 bytes
SHA-256: bfa32af85ed9733e9d329932c5444ef017f43cd1cf31216f18da05059aa2c43f