Malicious PDF — malware analysis report

Static analysis result for SHA-256 3180ff42f4b17975…

MALICIOUS

PDF

47.2 KB Created: 2021-06-14 01:10:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c3885b194179199cc926cf33512eeb7f SHA-1: 41c7a82186e47aaf686791309200bf7413ce84da SHA-256: 3180ff42f4b17975ba868a983e8fad77c7df8b8bdf41caaa5807785b370adb0e
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, designed to lure users into downloading game hacks or other potentially unwanted content. The document body and heuristics indicate a phishing or scam attempt, likely using a link farm to distribute malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://netcdn.co/app/431946152/roblox-free-not-to-download-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-coin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-do-reach-hacks-on-roblox-swordfighting_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-minecraft-severs_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-skins-free-girl_GM479516143.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_off00004a55.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A55 26780 bytes
SHA-256: 6c1df5ea311dc200611ecb4a28beb0a3b57e9bb6c3947fd5647cff60496da8a1
font_01_sfnt_off0000872e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x872E 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000943f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x943F 18788 bytes
SHA-256: 816e14324ce5e6d40acb265498e7463f84024bdf2c318b987de70feedacab310

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