Malicious PDF — malware analysis report

Static analysis result for SHA-256 537d3f7179114a18…

MALICIOUS

PDF

53.1 KB Created: 2021-05-11 01:00:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: efee06b4d15f4ead0d5cb38fc1447f5a SHA-1: 7ed2876a5454df3ab992ccece88949ec8babcc26 SHA-256: 537d3f7179114a188588523cff9ba0dd873188c51e3db0f07557edd7e03932b9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically a site offering a 'free Robux generator' or 'game hack'. The presence of these links, combined with the ML classifier flagging the PDF as malicious, indicates a phishing or scam attempt. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a lure for users to visit potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9231

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/431946152/free-robux-generator-no-verification-game-hack In PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-game-hacking_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-game_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.janabadra.ac.id/otomasi/repository/noob-vs-pro-vs-hacker-vs-god-minecraft_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_off00004d2c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D2C 30476 bytes
SHA-256: 27b0fa85eb4688cef25a17421d32b41997dc8f2bbd2ae6e62c7601646aa81c6a
font_01_sfnt_off000091b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91B2 8252 bytes
SHA-256: 7ebedd6b182173c8e55836cb0d114b2c4a0ac85c96a51b9f0706c935f8415fea
font_02_sfnt_off0000acc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC7 18600 bytes
SHA-256: fd611ad94f1c5362e5936d61a0ca6686a852f181e3b69dadbb107f1a26b259f7

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