Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb88b5a8da3c9a7d…

MALICIOUS

PDF

35.1 KB Created: 2021-07-06 08:01:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2b44b91504f66512a71d003851894eef SHA-1: a57cb7e0556f7c3097599ab5e9d6d1650a4d0cf2 SHA-256: fb88b5a8da3c9a7dfc436b7bc97469c38b2cba83ae263cb7281fe4b8b56c0dcb
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF document contains multiple links to a redirector hosted on netcdn.tw, which is associated with malicious activity and impersonates Microsoft. The document body and heuristics indicate a lure for free game hacks or generators, likely intended to phish for credentials or lead to further malware. No scripts were extracted, but the embedded URLs and the nature of the lure strongly suggest a phishing or credential harvesting attempt.

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/unlimited-robux-2021-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/unlimited-robux-2021-game-hack In PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-robux-birth-day-hack_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/hack-in-roblox-rc7_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/hack-bee-swarm-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-online-free_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-password-needed_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-2021-october_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-upload-audio-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-hack-unprotected-roblox-games_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-spins-on-coin-master-2021_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
font_00_sfnt_off00002fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB4 22916 bytes
SHA-256: a4dbf51bfd011480c1e854cd21c2343acd403950dd74618de477894c95db7c36
font_01_sfnt_off00006264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6264 19684 bytes
SHA-256: 91fc53409c83f775aa0608e789a258370bd95e9d85bc800bc25b224545327199

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