Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f5fd8f7d36a051…

MALICIOUS

PDF

45.7 KB Created: 2021-05-20 01:01:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 09cfc855eb4bd6d995a04f23bb44c658 SHA-1: bdfadee522e6a278faf3e98a87db6a44d1e327ab SHA-256: 86f5fd8f7d36a051c0f3bb715dd14b90e3e1454ef3433cc0837e73882c8dbed6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector pointing to a 'free generator / game hack' lure. The document body, though heavily obfuscated, contains references to game hacks and free spins, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.xyz/app/406889139/coin-master-free-spins-link-2021-today-game-hack In PDF document text
    • https://www.appartamenticroazia24.com/images/wurst-client-download_GM479516143.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/how-to-make-robux_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/robux-online_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/coin-master-hack-tips_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/pubg-uc-kharidna-hai_GM1330123889.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/pokemon-go-free-joystick-ios_GM1094591345.pdfIn PDF document text
    • https://www.appartamenticroazia24.com/images/pokemon-go-free-yveltal_GM1094591345.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_003_off0000477f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x477F 27132 bytes
SHA-256: 59c1c69a3bce7e361bd68937a8ff32d6bc9b6f02638dc1d87a92dd44f44f90dc
font_01_sfnt_off0000847f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x847F 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E31 18812 bytes
SHA-256: 705c5903f824403b328e8e9dbd2ab52a650d097fc3c0d4bbd34be772086d041a

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