Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f76b29e879bc49…

MALICIOUS

PDF

44.2 KB Created: 2021-06-07 02:25:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ecae9010f8696f65ad7613de03c67f93 SHA-1: 56f53a4affe0b4a796dcd5c129c193dc8b486dc1 SHA-256: 12f76b29e879bc49518fcfcdad422a9d0edd195c1d2166d1794a16a65b47d119
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that redirect to known malicious infrastructure, specifically promoting "game hacks" and "generators". The document body and heuristics confirm a lure for free in-game currency or cheats, which is a common social engineering tactic. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to lead the user to potentially harmful content or further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/robux-hack-giveaway-game-hack In PDF document text
    • http://mbbs.hr/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-tiktok-likes-quick_GM835599320.pdfIn PDF document text
    • http://mbbs.hr/files/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-website_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • https://mbbs.hr/files/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-t-shirt-roblox_GM431946152.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_off00004e70.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E70 24988 bytes
SHA-256: 687cc2861d7d9ba4378495ed53b0a665b3479331f7babbdd6adadc1dacb94203
font_01_sfnt_off00008846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8846 18828 bytes
SHA-256: 0af9b30b31da798737be5d6163272504ac8763ae24b76efab48ba5d5098d083b

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