Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbcc92d49dcb25e…

MALICIOUS

PDF

50.8 KB Created: 2021-06-07 12:28:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 096bb68359e2a7834cfa2ddedc75fece SHA-1: 95b66ce4bf6dfc3ac14ba8bfd8f94226b8a8b440 SHA-256: bbbcc92d49dcb25e21bb021641ef786cc3162004f448ce5cda87578946253a86
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body, though heavily obfuscated, contains references to hacking and the same malicious URL. The ML classifier also flagged this PDF with high confidence. The primary attack vector appears to be social engineering via a malicious link embedded within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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.tw/app/431946152/how-to-hack-peoples-passwords-on-roblox-game-hack In PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/a-file-with-hacked-games-roblox_GM431946152.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/free-roblox-us_GM431946152.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/free-robux-codes-2021-not-used-no-verification_GM431946152.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/roblox-area-14-hacking-script-pastebin_GM431946152.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/roblox-hack-slx_GM431946152.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/roblox-rainbow-shaggy-free_GM431946152.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/how-to-hack-websites-like-roblox_GM431946152.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/speed-hacks-roblox-download_GM431946152.pdfIn PDF document text
    • https://forensicsinstitute.org/wp-content/uploads/fsqm-files/free-robux-generator-2021-real_GM431946152.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_off0000549a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x549A 26380 bytes
SHA-256: 79ac89cc0eb6afef371ff9463c099ec16fede5f451ab39f6791b6766e7445332
font_01_sfnt_off00009092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9092 7308 bytes
SHA-256: 0ca7358235c46123c2947efff2ccf151d2cfa23bc1e3b9eb3a89ae1012e07605
font_02_sfnt_off0000a239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA239 18852 bytes
SHA-256: d003473aa48930e908f8eb93aaba6c2f706d1d5e65f934b8285ad4b9a2717d66