Malicious PDF — malware analysis report

Static analysis result for SHA-256 41951b7c7868a303…

MALICIOUS

PDF

45.6 KB Created: 2021-06-04 01:41:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: dbf03617af3d89c6c27fd15ad5eb6c4c SHA-1: 9b5d82225a550aa52231ce5a12bd80d525ec6cd3 SHA-256: 41951b7c7868a3034d8fe95ce82bc6f2ba2f47834413731e28e82a21a3dddaf9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, masquerading as game hacks or giveaways. The heuristic firings indicate that the document is designed to lure users to these malicious sites, likely for further exploitation or credential harvesting. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • 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.
  • 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/hacks-for-minecraft-windows-10-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-link-2021_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_off000052d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D2 25904 bytes
SHA-256: 3ed2175d3919a08e19735d3b2ab59d12624413ca7e31a7c436ca181a2df29779
font_01_sfnt_off00008e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8B 18696 bytes
SHA-256: cd39c091a68a2846e65319e0aedb696a747600c4d9ed3e222f28c6d266d57a0c

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