Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ec55650798b32b…

MALICIOUS

PDF

42.5 KB Created: 2021-05-13 16:17:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a332de73016683dc07b57b05e49072e9 SHA-1: bcdf0bbce3ba0a47207ad939f450ec3d426007ee SHA-256: 31ec55650798b32b65327bd4d2de10a4b1a606e9e62bd09eb908617931a41cc5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and free spins. The primary redirect URL is https://netcdn.xyz/app/406889139/10-free-spins-coin-master-game-hack. The document body and embedded links suggest a lure to trick users into visiting these sites, likely for credential harvesting or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/10-free-spins-coin-master-game-hack In PDF document text
    • http://www.fabbrotorino.eu/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-free-spins-link-hack_GM406889139.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/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/spin-coin-master-free_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_003_off00004b9a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B9A 24712 bytes
SHA-256: d6a6fb7c04f55b037fac96bf0c091350fd36d5f4307850a50f25158ff7e03d39
font_01_sfnt_off00008429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8429 18164 bytes
SHA-256: 9bc61af2acbda784231945e40c4a4bb5d6810b0d04641be6b37b2cdd3c5b78bc

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