Malicious PDF — malware analysis report

Static analysis result for SHA-256 0647ea1315656ef8…

MALICIOUS

PDF

49.7 KB Created: 2021-06-03 10:31:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 77a3084aa52daafb7884b96ee8672828 SHA-1: 0b77914b2281d8ec85b30d5ad71564e9cb491fdd SHA-256: 0647ea1315656ef89617db2a02e229f6e70db06028f9088f0d3940080dbeeff6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a malicious website, identified as a lure for game hacks or free currency. The document body, though heavily obfuscated, contains references to 'Earn Robux By Watching Ads' and a URL matching the malicious redirector. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate 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.online/app/431946152/earn-robux-by-watching-ads-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/robux-get-com_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/rbx-sites_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/freerubux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/www-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-hack-coin-master-spin-in-hindi_GM406889139.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_off0000510c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x510C 26784 bytes
SHA-256: ed457b5cf241622d1331de2acbb675c5e845dc44c1235df18e0ddb15cfafa4c4
font_01_sfnt_off00008f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8B 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C9D 19308 bytes
SHA-256: 98ad3598e8594ec5302aafe1fe5cf943057628d72e047ac0ae3feb628a09087f

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