Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff319732cbabbe3…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 12:15:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 425cd39e2f40a0e5d40184e18936c02d SHA-1: 9a29b1b2bb4edd7c5d6ac88b23c7b1a0dc9bd703 SHA-256: fff319732cbabbe3fc1a34da98bd06d773c2cc88f59464594a5b91ca0f730633
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a malicious redirector, disguised as a generator for game hacks and currency. The document body and heuristics indicate a lure for free in-game items, a common social engineering tactic. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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/479516143/minecraft-free-ios-2021-game-hack In PDF document text
    • http://library.yamasi.ac.id//repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/get-free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pokemon-go-free-coin-promo-code_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_004_off000050b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B0 24428 bytes
SHA-256: fb428f6767233ddc53b50168b1f626085d607afa7e308d08c006c64a3470a954
font_01_sfnt_off0000881a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x881A 2912 bytes
SHA-256: fa76cc2dab30b56d5305de71ce949b6adffd6580af2f26905a33966a3200adbb
font_02_sfnt_off00009216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9216 18112 bytes
SHA-256: b55c1404a277e69c847ae3cf6ace6563469f03eb0031cfae1db94f462975a683

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