Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde502c5d39718ba…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 17:59:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 34fb11e57bcb0f78bb2a16e85cc61bab SHA-1: 2348d2629cb13c05dbdba7bcbd568f1e0cb53f57 SHA-256: cde502c5d39718babe12d667ce25c14a72179c7a44e275617e6734939c36be97
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector hosted on 'netcdn.tw', which is flagged as malicious. The document body and embedded URLs suggest a lure for free game currency or hacks, aiming to trick users into visiting the malicious site. No scripts were extracted, but the PDF structure and malicious links indicate a phishing or redirection attempt.

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/406889139/ear-free-spins-for-coin-master-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/only-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/www-roblox-play-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-sell-stuff-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/easy-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-x10-xp-bleach-soul-of-end-v175-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-apk-35-13_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_002_off000030b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30B3 23200 bytes
SHA-256: 65cd7c76882ab67ee22d8e9bb3d305ff92e6cd5b754c1f3666f31f7415257ec2
font_01_sfnt_off0000651a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651A 18176 bytes
SHA-256: 8cb6e5092b491550e7b215afb87da4ecb4c91e5b5bb3d5caa4fd4e6f3eb8d81f

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