Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e8b45e3b8d9d23…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 09:17:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: aa018a7a0300528cde8e78b70672690c SHA-1: 77473eb9d73a4b12ff7b55e0c64d93bbb5f501fe SHA-256: c7e8b45e3b8d9d231e52b4d25ce1e84e1a8a94718f3ae3229eb43ec9cc396e49
160 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body and heuristics indicate a social engineering tactic to trick users into clicking these links, likely leading to further malware downloads or phishing pages. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/431946152/how-to-get-free-robux-on-computer-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-spin-link-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-level-7-script-for-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/get-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-really-easy_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/cb-ro-hack-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/pubg-uc-bc-com_GM1330123889.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_off00003059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3059 22252 bytes
SHA-256: 79af87753f7192515a00750cdd177bebcf10338e348ffe46c20fae915558cc15
font_01_sfnt_off000061b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B4 19420 bytes
SHA-256: 4eeda5a53974dafe6a6a7eb0474e8c00647b290d21ead3df531c01c0ce008c20

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