Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afe42e12ddd0469…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 18:30:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b806d63df0a677e20bcc157fa7aa398c SHA-1: 8baa84840768b422e24ed1808386b2aec870ef81 SHA-256: 9afe42e12ddd0469e8fb9f39a2bcb146990ce362dc2a0d9dd4f97a71f037db92
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux and Robux Hack 2021'. The document body and embedded links strongly suggest a phishing or scam lure designed to trick users into visiting malicious sites. No scripts were extracted, but the presence of malicious links and the lure content indicate a high likelihood of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/free-robux-and-robux-hack-2021-game-hack In PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/hack-meme-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-have-a-mad-city-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-free-robux-codes-http-bitly-robloxinstantapp_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-hack-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-free-robux-2021-august-promocode_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/cheat-files-download-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/wild-savannah-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/get-robux-free-generator_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/noxplayer-speed-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/cheat-codes-for-tuber-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-admin-commands-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-roblox-card-codes-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/full-server-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-hack-genorator_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/give-me-free-roblox_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_off00002ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF0 22588 bytes
SHA-256: dfc21322884603b4c3334956ddefe5d9ef459d523e6a0d744def7663face58c7
font_01_sfnt_off00006255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6255 19460 bytes
SHA-256: 53de2ea72705e1bcb567f1a4d55e15a9f63a793b6b7535849e09fb9dd2b4a960

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