Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28ebd489d23f975…

MALICIOUS

PDF

45.1 KB Created: 2021-05-14 17:30:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: dadbd3699733da82803951de688c1398 SHA-1: 29778aceee32be4fa22b9c1d9c1b1eededc39827 SHA-256: e28ebd489d23f97582b23ae0edca7659b88b46766137f74e2c502da138d08040
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, disguised as game hacks or free generators. It also presents a fake CAPTCHA to trick users into interacting with the malicious content. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coinmaster-game-hack, which is likely used to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/coinmaster-game-hack In PDF document text
    • http://www.fabbrotorino.eu/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/roblox-free-pants_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-3533-android-hack_GM406889139.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_off0000493d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x493D 24360 bytes
SHA-256: 934844b7ddcd5550af020b30957b7715b37ee66649c66a2682a5e3bf7e298898
font_01_sfnt_off00008132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8132 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1C 19136 bytes
SHA-256: 2cd040d70777c5a3365d3ee62d0c635538479f953e6a1dd7e0dabb3189396a86

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