Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f75d5e325c9ed4…

MALICIOUS

PDF

32.5 KB Created: 2021-07-19 11:37:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8c74ca678fb117286fbedd06c284e15d SHA-1: 0287445e4557beffb43e335f04b94ddba7bb97aa SHA-256: 43f75d5e325c9ed43c1811ec92ade17d4adc83bc913a82e17e4fa83a9de34278
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to redirectors and malicious infrastructure, disguised as "free generator" or "game hack" lures. The document body explicitly contains calls to action like "CLICK HERE TO ACCESS ROBUX GENERATOR" and directs users to download further files. This indicates a clear intent to trick users into visiting malicious sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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/431946152/claim-free-robux-game-hack In PDF document text
    • https://shjbottle.com/upload/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://shjbottle.com/upload/files/free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • https://shjbottle.com/upload/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • https://shjbottle.com/upload/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://shjbottle.com/upload/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://shjbottle.com/upload/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://shjbottle.com/upload/files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • https://shjbottle.com/upload/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://shjbottle.com/upload/files/free-minecraft-skins_GM479516143.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_off00002952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2952 22476 bytes
SHA-256: 796950eaafa0e93ce08dde30e8a9c6deb18c0f3c12d6f4e1c8abc6cf43bce391
font_01_sfnt_off00005b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B52 18884 bytes
SHA-256: ae76db074a4b7bd0cf2df4b3c3d771d873f937dbbe8778acf7ef920e6df55ea5