Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b8da860e2c6a0f…

MALICIOUS

PDF

34.2 KB Created: 2021-07-08 00:13:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f987ed06bc12a8a4e6b0e2906bd4920b SHA-1: b463c6c1e983e0700424241f67702740b5961b57 SHA-256: f6b8da860e2c6a0f7f98e13bd2aa44dfdd463753dd5899b4178e2aeb5c84c53a
160 Risk Score

Malware Insights

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

The PDF document contains a lure for game hacks and free currency, directing users to a known malicious redirector. The document body and embedded URLs strongly suggest a phishing or scam attempt to trick users into visiting malicious sites. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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/406889139/hack-to-get-free-spins-on-coin-master-game-hack In PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/prison-life-script-roblox-hack-pastebin_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-super-villain-tycoon-cheats_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-cool-clothes-cheat_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-no-download-no-verification_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-hacking-admin-commands-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/robux-cheat_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-roblox-card_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-get-free-faces-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/a-lot-of-robux_GM431946152.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_off00003047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3047 22876 bytes
SHA-256: 60f1c1f2407f0f28f5db83a767a9b69c254f65d705b80ab222e7376149c5d6ab
font_01_sfnt_off000062c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C1 18344 bytes
SHA-256: 49656a9ce1f79f371d4147e6373d1b345a80f0cbc55be9fbc1109b8dbb6a841c

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