Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9d2bb1c96a9feb…

MALICIOUS

PDF

43.4 KB Created: 2021-06-13 19:17:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e5c551e81cc302af862d8ba08bbbe4f9 SHA-1: f056aacb55094ebafe62a86b7d1015b8d544e2c7 SHA-256: 9b9d2bb1c96a9feb5ef242b297783ab5e8da56cc6cc3f3c0764c5d0ef02cee64
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that are presented as lures for free game currency and hacks. The heuristic firings indicate that these links lead to known malicious redirectors and are designed to trick users into visiting potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.co/app/431946152/how-to-get-free-robux-no-hack-april-2021-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hiw-to-get-free-robux-on-your-phone_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-on-pc-no-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-more-free-coins-on-coin-master_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_003_off00004a1a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A1A 24920 bytes
SHA-256: 5b511ece578700dbe6379c3b16498d2e41087b3ed5ffee04ec9d9238e2f2c24b
font_01_sfnt_off000083a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A0 19452 bytes
SHA-256: c5e76978801bc1bcd4b72baa7db0c855ad41a04d0a0d71a0580e4517753402ca

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