Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae5e6a661d9a4f1…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 07:46:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0316acdb763f8e2744efbb14124c7c9b SHA-1: d0c404532b3736622e52fd014be0a0f513a71625 SHA-256: 9ae5e6a661d9a4f1a3a13cac9bf5eacc5be5f588032836c1b70bc300aa8c620d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector for a 'game hack'. The primary malicious link, https://netcdn.online/app/406889139/safe-hack-for-coin-master-android-game-hack, is designed to lure users into downloading potentially harmful content. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to untrusted infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/406889139/safe-hack-for-coin-master-android-game-hack In PDF document text
    • http://perpus.unpam.ac.id/repository/robux-hack_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/pokemon-go-free-pokeballs-code_GM1094591345.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004dc9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DC9 30236 bytes
SHA-256: b120ff24af221260b2259e0193fad8cceed8d822b1769cb2af3024e5cdf457f4
font_01_sfnt_off00008b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B53 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off0000953e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x953E 18056 bytes
SHA-256: bd908f19796ba70790696a44cc442d1e4905b0dc020f0f88dcb028517c2e99ee

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