Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad03eff8058e851…

MALICIOUS

PDF

44.9 KB Created: 2021-06-09 03:23:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: feb4715be79a7e98946491d489fe6656 SHA-1: 4794961a0a831cc65f64ce6d98bf60ff1f5a5b0a SHA-256: 4ad03eff8058e8513c3832e0348ce659d6d980605c3bbdd1a90b74cf9044fcf2
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body, though heavily obfuscated, contains references to 'Roblox Hack' and a URL that aligns with the heuristic findings. The presence of embedded URLs and the nature of the lure suggest an attempt to trick users into visiting a malicious site, likely to download further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/roblox-hack-deutsch-auf-pc-robux-game-hack In PDF document text
    • https://www.acacss.com/images/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • https://www.acacss.com/images/robux-now_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/free-robux-net_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/rbx-roblox_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://www.acacss.com/images/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://www.acacss.com/images/free-robux-live_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/coin-master-free-coins_GM406889139.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
stream_004_off00004c6f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C6F 27440 bytes
SHA-256: 322cd617fbf369746ed11ba90535362e1e8704a7d4737098012b2049b6ae57ac
font_01_sfnt_off00008b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B28 18912 bytes
SHA-256: 52a1c11692d9d2a76453087bf810f2a4670ec81949b4d3988d7ee3ac7c2e0c94