Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ca740ed0f002cb…

MALICIOUS

PDF

45.3 KB Created: 2021-06-03 12:22:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 79f7d6540dc50989a3ae55de3f406e6e SHA-1: 51b300ce896837b4f7d83f13c87f27fbf35d547d SHA-256: c8ca740ed0f002cb31e2c4761b7118aba7a60a8443e2b4d1f6c34d9a5c94f722
220 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors, including one specifically for a "free executor Roblox game hack". It also employs a fake CAPTCHA lure to trick users into interacting with the malicious content. The presence of these elements strongly suggests an attempt to deliver a second-stage payload or lead the user to a phishing or scam site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.online/app/431946152/free-executor-roblox-game-hack In PDF document text
    • https://www.insol-europe.org/uploads/files/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/150-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-free-items_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/mc-update_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-free-cards-on-coin-master_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_off00004fe3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE3 27384 bytes
SHA-256: ae2058e611bfdcf2fc40f31ee4522ec9ac276b37cb22b96756d6ab2e69b74ae5
font_01_sfnt_off00008eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB7 18192 bytes
SHA-256: 76421a682e25ddc3073895da10e5f06be723ab9914bfc49cca563022476f5c91

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