Malicious PDF — malware analysis report

Static analysis result for SHA-256 76680a28655331fe…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 22:27:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3188531d93f4e176ebcb2a4f487c92c5 SHA-1: e3a1333e91d5006eab46962a00713d40437a9390 SHA-256: 76680a28655331fe2eb38fc1d527355a2105b1fb467bf6ddbdf327e222993d10
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link to a malicious redirector disguised as a game hack generator, which is a common lure for phishing or malware distribution. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains references to the malicious URL, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/479516143/free-minecraft-alt-generator-game-hack In PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/can-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/pokemon-go-free-move_GM1094591345.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/roblox-girl-avatar_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_off00005302.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5302 25872 bytes
SHA-256: f7b7d8744ae1821ddb58ff6713549cd88344fb94b84d8d034f7435045a10b2e3
font_01_sfnt_off00008d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D81 17784 bytes
SHA-256: 66ae3cfb6d310f144f42187aaa203441353bb0cc88c1a3915b2f7a14fa3c41b8

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