Malicious PDF — malware analysis report

Static analysis result for SHA-256 e303f7a53091ad30…

MALICIOUS

PDF

46.1 KB Created: 2021-06-07 09:28:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b750ed99f6d7c88972611bc13dc90263 SHA-1: 3b97f5c32ee0229374f4fcc6761c346091d15db9 SHA-256: e303f7a53091ad30e12485e6ca6d4379a752b03f0b958b4e203a7e963f2669ae
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for game-related content, specifically mentioning 'Robux' and 'game hack', and includes a call-to-action button. It links to a known malicious redirector infrastructure, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/robux-how-to-get-without-glitch-or-hack-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/free-coin_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-400-spins-coins-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/pokemon-go-free-85_GM1094591345.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-cheat-robux_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
stream_004_off000053e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53E3 25680 bytes
SHA-256: b5f6790fdf0b766d05f9978095c8eb1eb76d5aa5941ce79eebbbc7d7dd89e78c
font_01_sfnt_off00008f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6A 19076 bytes
SHA-256: 1b5315f3c1d3fa22c12de67de09b2adf84c97ff0b426e1d29fc30238c4d06165

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