Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd532d2f0038af61…

MALICIOUS

PDF

46.5 KB Created: 2021-06-08 18:47:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 16f26a9c8c05182ad8b5f64792604d07 SHA-1: 53e8745a1f845d5356f82d7d0efb9a5952673f62 SHA-256: fd532d2f0038af6105bd8b058ccd3ca22aa1e7d34a77613062b336a9efe142fc
142 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are structured as SEO link farms. The primary lure appears to be related to game hacks and free in-game currency, such as 'Roblox Hack' and 'free Robux'. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' indicates these links likely redirect to malicious content or downloads. While no scripts were explicitly extracted, the nature of the links and the ML classification suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/webdevs-roblox-hack-game-hack PDF link annotation
    • http://apx-centre.ru/images/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-app-without-human-verification_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/mobile4free24-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/rbx-points-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/dungeon-quest-hacks-download-roblox_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-code-for-free-spins_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
stream_004_off00005048.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5048 28840 bytes
SHA-256: bc7fcdc6299c3021c7ef4ceeb47966f0644a6ca5abd0df87634e672b9afd2210
font_01_sfnt_off0000921c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x921C 18668 bytes
SHA-256: 95f684631b0683e797c0ac104406b9f6603d928c26a150ef78b0d4c750003a3c

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