Malicious PDF — malware analysis report

Static analysis result for SHA-256 151343835723a320…

MALICIOUS

PDF

49.7 KB Created: 2021-06-09 15:39:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2ee09e5935e29b6017d142a554b05748 SHA-1: 17c54e6dfdff008a5a7f0d7cba25ca8e8c5edbf1 SHA-256: 151343835723a320b1ad2987b1465ad982577597d2e5d7f0e0fa04746285a739
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, disguised as a 'free generator' or 'game hack' lure. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be part of a social engineering attempt to trick users into visiting the link. The presence of multiple PDF-specific heuristics related to malicious redirects and lures strongly indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/roblox-free-robux-card-game-hack In 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/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/world-conquest-free-siterobloxcomgames_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/piano-player-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-builders-club-hack-download_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-generator_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005254.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5254 27476 bytes
SHA-256: 78c742174237010226ae21a36baf39a799a7909f89eec015066cefa9786cbf61
font_01_sfnt_off000091fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91FA 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F0B 18492 bytes
SHA-256: fe8c3c46b28ff2d5331ecdfb0df57c0e93549ff3e64c2651a8367fc06a49f4d3

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