Malicious PDF — malware analysis report

Static analysis result for SHA-256 4725affe970be415…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 13:25:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 301a0c1ab66ed51a46d445da0e1b7a1b SHA-1: 8e2e18b8543cebbbc7daadb4b85eeb97c417f640 SHA-256: 4725affe970be41561a963d344e957e28dcf06d05e1c28e910dbeee3ec08810b
200 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors and impersonates Microsoft to lure users into clicking on a "free generator / game hack" link. The primary malicious link is https://netcdn.online/app/431946152/microsoft-free-robux-game-hack, which is associated with credential phishing or malware distribution. No scripts were extracted, but the document structure and embedded URLs strongly indicate a phishing or malware delivery attempt.

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/431946152/microsoft-free-robux-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/431946152/microsoft-free-robux-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hack-coin-master-android-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/tiktok-free-hosting_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-mobile_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/real-working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.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_off00004e8f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E8F 26744 bytes
SHA-256: caa5e7751154d557063484b7821d298c9287252d088dbbc2a61e0e23d984d779
font_01_sfnt_off00008989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8989 18436 bytes
SHA-256: fc8058b2753a804d67589ad9e7736472a77fa92b8b7356ad3bc1ab00ed4087a5

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