Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4781afe8a6603c…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 11:24:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1b42ee3f17f26a6ba8e08c7852bbc392 SHA-1: a244edefade39caee14b03214b3c64de676e8e9d SHA-256: cc4781afe8a6603c4f09683723e84bdc96d56af25fb671f728a680bdf72c0609
200 Risk Score

Malware Insights

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

The PDF document contains multiple links designed to lure users into clicking on what appears to be a 'free generator' or 'game hack' for Roblox, impersonating the PayPal brand. The primary link, http://netcdn.tw/app/431946152/earn-robux-for-roblox-game-hack, redirects to a known malicious infrastructure. This suggests the document is part of a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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: http://netcdn.tw/app/431946152/earn-robux-for-roblox-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 http://netcdn.tw/app/431946152/earn-robux-for-roblox-game-hack In PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-and-spin_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/rbx-sites_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-pink-hair-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/kachifpro_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/can-you-give-me-free-robux_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
font_00_sfnt_off00003086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3086 22068 bytes
SHA-256: c88f7020da935b831a271a466c4eaa8b4c83c7cf278a3510ee6c196af6ac0130
font_01_sfnt_off00006129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6129 18788 bytes
SHA-256: 0bc757e384426ca805e3ff9f70e444179e0a5420f9e2497b826f86f250a96fbd

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