Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d30b8510bf953c9…

MALICIOUS

PDF

47.0 KB Created: 2021-06-04 03:35:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 21cf8e54a5605e4bb5213a1e6ca0e0c0 SHA-1: 325d7a68a9e9e24a96d6608e4299b200ae66491d SHA-256: 4d30b8510bf953c93fd93eedfe8db464bebcf050a72df11fbc34da676a34ee89
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and free generators. The primary malicious URL identified is https://netcdn.online/app/479516143/minecraft-coins-free-game-hack, which is linked from the document body and flagged by critical heuristics. The document also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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
  • 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://netcdn.online/app/479516143/minecraft-coins-free-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-website_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000507b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x507B 34632 bytes
SHA-256: 1a9b80ccbd31b2da964af32af8fbe4c4b739807b9fcad970d6b5d8e40a97b5bc
font_01_sfnt_off00009725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9725 17712 bytes
SHA-256: f11cf7a31a005d7bc14b9508c64b9243aa3fd98d87a18c3c2fdef7c62eb0ce9c

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