Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd6ca4914dc13d7…

MALICIOUS

PDF

45.9 KB Created: 2021-05-14 14:47:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a399f85678decd55bd69bf78635f7288 SHA-1: 179da88165c924fe4f6ab6088e13370154896fa5 SHA-256: 3cd6ca4914dc13d77155a860f3d3d40e44a4e96379fb254ec202a2437fe9ae1e
200 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 disguised as "free generator / game hack" lures, impersonating PayPal. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-without-verification-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing and redirection attempt, likely leading to further malicious content or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-robux-without-verification-game-hack.
  • 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/431946152/free-robux-without-verification-game-hack In PDF document text
    • https://ethraa-sys.com/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/roblox-comroblox_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/fast-robux-online_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • https://ethraa-sys.com/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000481b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x481B 25248 bytes
SHA-256: e8fd0c5dfc8b24995b7247a51fd626b077ba636637091f6f259639717eef74f9
font_01_sfnt_off0000822c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822C 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00008ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED4 18964 bytes
SHA-256: 5864977637737ef4e1bd5b7bfc66e5602b8aa3d3ed60f74fb5f96fd63c3aa8ef

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