Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dedac42063ca0f…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 16:41:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: df4603c42623a0e18aa44e5016049a38 SHA-1: e4bb387fcebb8167e62c3faeb366f97209b962bf SHA-256: 77dedac42063ca0ffa9c63e59eaffc0a3f844512427f3f3863b3e240b76481f4
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are disguised as game-related hacks or generators. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm designed to attract users. The primary lure appears to be related to Roblox and Coin Master, promising free items or currency. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a download button lure further supports a malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/roblox-trade-free-game-hack PDF link annotation
    • http://perpustakaan.iaiqi.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-robux-accounts-v3rmillion_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/is-roblox-on-ps4-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-robux-without-verifacation_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/boku-no-roblox-working-hack-script_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/1-1-1-1-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-roblox-accounts-with-obc_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/roblox-thomas-game-online-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-robux-today-no-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/roblox-booga-booga-cheat-engine-how-to-get-unlimited-essence_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-roblox-exploits-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/hack-struicid-stop-start-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-robux-glitch-2021-ios_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_off00003169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3169 21992 bytes
SHA-256: 3c8b067c9738f82261bc7b310499dd38060dfd23cba7696ccd2497f95923d196
font_01_sfnt_off00006231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 18824 bytes
SHA-256: 6adbb6ebfaf30e9a24ca718276f2621fd5fce9720e3824a9c81379787d751ccd

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