Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbbd5ec7a6f1657…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 19:50:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8330eb549bceb47c3e932eda8e1c60d5 SHA-1: ab93ba059d57c52f0833ad09a6e5cb83460e8612 SHA-256: 9fbbd5ec7a6f165765f2c34633980e3976e8bb43e144ca1a7502f2bdd0ccc59c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/406889139/coin-master-game-hack-apk-game-hack. The document body and extracted URLs suggest a lure for game hacks and free in-game currency, likely intended to trick users into downloading further malware or visiting malicious sites. No scripts were extracted, but the presence of malicious redirectors and the lure indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-game-hack-apk-game-hack In PDF document text
    • http://achauco.vn/public/upload/files/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/create-roblox-faces-free_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-prison-life-swat-gear-free_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-dinosaur-simulator-free_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-hacking-for-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/confiscation-roblox-hack_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-skyscraper-tycoon-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/dragon-ball-z-rage-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/game-give-free-robux_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
font_00_sfnt_off00003342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3342 22668 bytes
SHA-256: dddfddcc6c3da322256b1033ba324589756fbb71f53c96d0576b97d66828dd27
font_01_sfnt_off000065c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C2 18440 bytes
SHA-256: 571ab4b458d0dac508f9535f575fba5b7e94d60ff2bdf8022b00b4ca59ab09de