Malicious PDF — malware analysis report

Static analysis result for SHA-256 655f1eacb0710b96…

MALICIOUS

PDF

43.6 KB Created: 2021-05-10 19:20:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b56a878b7fbe5af55415c4ebb9d25977 SHA-1: 6167de611d472856b5cf0e225e23f2d55c499b68 SHA-256: 655f1eacb0710b96d04c7dd460042332b88d4aa15a81fa3fdeaec2797fa9d7de
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The document body and embedded links suggest a phishing or scam attempt, likely to lead users to download potentially unwanted applications or further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • 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.xyz/app/406889139/coin-master-hack-xyz-download-game-hack In PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/moon-active-games_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/roblox40com-robux_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/how-to-hack-roblox-accounts-on-phone_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
stream_003_off00004d26.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D26 24860 bytes
SHA-256: fd1ccce9c769ccbe12725f3c50586959295e327901c4dd0a7149be69bb74d964
font_01_sfnt_off0000864f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x864F 18784 bytes
SHA-256: f71b0506c37c5e894201c375a350e25167e86e9b1a7bf9117161ac3213dc7128

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