Malicious PDF — malware analysis report

Static analysis result for SHA-256 88183fe5b4585081…

MALICIOUS

PDF

45.7 KB Created: 2021-06-10 23:57:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 48331012d9626195429f3ea4080944ba SHA-1: aa0518bda8d28c75b91f1ba30124e43a473abebf SHA-256: 88183fe5b458508176c2b20b9069bfe91082c6b3cbb1b839c9cdb2473ac2751c
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 lure, redirecting to known malicious infrastructure. The document body, though heavily obfuscated, contains references to 'Hack Para Comprar Robux' and a URL that aligns with the heuristic findings. The ML classifier also flagged this PDF with high confidence. The embedded URL is likely used to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/hack-para-comprar-robux-game-hack In PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/roblox-prison-life-free-swat_GM431946152.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/cheat-roblox-skin_GM431946152.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/free-robux-net_GM431946152.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005287.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5287 26312 bytes
SHA-256: 7a92dc0ad0d6fcd3b9c6b76a99217de01f2eb9df0d386c58027d2cf491157bec
font_01_sfnt_off00008e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7D 18836 bytes
SHA-256: 405fdef96e63e18b35af3b14b12241ecc25cffe0c83e7111c3b51513b0b7a255

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