Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ec128cf9fe2b96…

MALICIOUS

PDF

44.6 KB Created: 2021-06-04 00:42:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 21d5600e5bed7c86127a1346c2726ce8 SHA-1: 90cbe6401d5ac5c6e22a467013403a37e7e9d01d SHA-256: 25ec128cf9fe2b96f4c7c0d0e852903d3dbf5b21264d07477d623022c61805e0
200 Risk Score

Malware Insights

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

This PDF document employs a lure of free game generators and hacks, impersonating brands like Facebook to trick users into clicking malicious links. The embedded links redirect to known malicious infrastructure, suggesting an intent to phish credentials or deliver further malware. No scripts were extracted, but the PDF structure itself contains the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/how-to-generate-free-coin-master-spin-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.online/app/406889139/how-to-generate-free-coin-master-spin-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-coin-master-app_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/is-windows-10-minecraft-free_GM479516143.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_off00004e61.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E61 28036 bytes
SHA-256: ea4eeb00b49d0e57d0ad1da6d4073a14a7ada4575c6bc8b6aa8e825cdbd8642b
font_01_sfnt_off00008c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5B 18052 bytes
SHA-256: bc7397b7892e84f8f438cdf02f94402a75785e8c4a68cee0805b100b0e31cd84

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