Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c398b056f167888…

MALICIOUS

PDF

43.0 KB Created: 2021-05-10 17:39:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2560565f8c84874547d28bc9791a01b1 SHA-1: 59f58456de5cac3cf73446cac39fece528f3ffa5 SHA-256: 4c398b056f1678886cef5ecb460455591115913c0176943ea2ca75a729b2a217
200 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as a "free generator / game hack" for Coin Master. This lure impersonates the Facebook brand but directs users to a non-Facebook host, indicating a credential phishing attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest a potential for further malicious activity, such as downloading additional payloads or redirecting to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-free-master-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/406889139/coin-free-master-game-hack In PDF document text
    • https://www.brainpads.com/images/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/coinmaster-hack_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.brainpads.com/images/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/minecraft-net-free_GM479516143.pdfIn PDF document text
    • https://www.brainpads.com/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • https://www.brainpads.com/images/free-flip-master-coins_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_003_off00004dd4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DD4 25580 bytes
SHA-256: 0c8cd72ca2cb088e3c9aab6b46f124fa3cc4b3c01eee449065f15a1ad73f53ae
font_01_sfnt_off00008779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8779 17712 bytes
SHA-256: d81df6b65cf0bb045415549e23d0eb9d7e4a9ed7c869613af9af95d8dd41029c

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