Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a082b96154a1d2…

MALICIOUS

PDF

48.9 KB Created: 2021-06-03 13:28:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 76caffa0f63d1ac1610746f45d62dc9f SHA-1: b3aa9e94a7e21e123d23c83c3e2ae3cc8fbc336b SHA-256: d4a082b96154a1d22cd0d37f179beef31260ea59db88bab089b8b7f4faec5e30
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to what appears to be a malicious redirector infrastructure, disguised as a game hack generator. The ML classifier also flagged this PDF as malicious. The document body contains obfuscated text and URLs that likely lead to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/406889139/coin-master-cheats-free-spins-game-hack In PDF document text
    • http://library.yamasi.ac.id//repository/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/mathep_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-coin-master-spins-daily_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_004_off000051cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51CC 30708 bytes
SHA-256: 2fd11ffeb9908e236fabb685118c59015f2c3861b912736f87cdcb2b6ec19776
font_01_sfnt_off000093c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93C4 2824 bytes
SHA-256: a0d6c1ef1f7405ab05245801e4abbc2877925f97898db53811df9ab010e978fa
font_02_sfnt_off00009d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D62 18052 bytes
SHA-256: 78e09613e9051ea2c05113a2cb3e2459165660dd7357248de65be6b789990433

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