Malicious PDF — malware analysis report

Static analysis result for SHA-256 388e23b096668c6d…

MALICIOUS

PDF

33.1 KB Created: 2021-07-05 17:55:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5c88a303016992bf9ef22e0756b3483f SHA-1: 902405059a226a648580a819e270799efecdb161 SHA-256: 388e23b096668c6ddaba9aa878d4f448041d925b5a7d267cb36304244f923a71
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure, masquerading as a 'free generator / game hack'. The document body and embedded URLs strongly suggest a lure for obtaining free in-game currency or hacks, which is a common social engineering tactic. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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.
  • 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/how-to-get-free-robux-hack-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/roblox-avatar-free-items_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-robux-for-free-for-children_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/claimrobux-net_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-obc-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/rolbox-hacks-for-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/join-this-group-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/cheat-engine-roblox-windows-8_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-arsenal-aimbot-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-gift-card-giveaway_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-using-tampermonkey_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-roblox-android-step-by-step-anddoid_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_off00002ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC3 22236 bytes
SHA-256: cd91f81f5e7a387b84eeeb42fed65c960c8b1dbc4e061e8e3bd786d39a39fc56
font_01_sfnt_off00005c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C36 19152 bytes
SHA-256: a9bff55de90b7722e0be476df1c7a65da1171d9638b3b21a902752e59eae7e63

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