Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b5a0ee5f9bfc02…

MALICIOUS

PDF

43.6 KB Created: 2021-06-04 01:11:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cf23fb9c3b5faa3714f255ef19c8d56a SHA-1: 0e57606c56ad9f8b9ef258e1c10d3064dab32e4f SHA-256: 34b5a0ee5f9bfc0299b0f6d1e381d3600b457b4dfb9a8eb5a1a8f6f5b399ec9b
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document contains multiple links to a redirector service that impersonates brands like Facebook and offers 'free generator' or 'game hack' lures. The primary link, https://netcdn.online/app/431946152/free-robux-clothes-game-hack, is associated with credential phishing and potentially malware distribution. The document's structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at tricking users into clicking 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/431946152/free-robux-clothes-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/free-robux-clothes-game-hack In PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/robux-apk_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-spins-coinmaster_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/earn-free-robux-for-roblox_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_004_off00004ff1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FF1 24464 bytes
SHA-256: bddcdfd44035e356cbd2529c88ef4afacb5405c1030a99dca9274b6a741a6cfd
font_01_sfnt_off00008785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8785 18360 bytes
SHA-256: a1d18e52fe431c3fa184e800cbb116f4a676a51d8f231eb3c7a40e64f11ea3a2

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