Malicious PDF — malware analysis report

Static analysis result for SHA-256 29729ba138135db5…

MALICIOUS

PDF

47.7 KB Created: 2021-06-04 03:29:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3ff29402b134b94550ca4f8ecaec085e SHA-1: 96a8d8e22ac3fa45c002c36f0b7bd929c9b08660 SHA-256: 29729ba138135db5ce5e83cd937572c7f797f0a56500daaa9fd2b65c171b8d13
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as a 'free generator / game hack'. The document body, though heavily obfuscated, contains references to game-related lures and the malicious URL. The presence of embedded URLs and the ML classifier flagging it as malicious strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/479516143/is-there-a-free-version-of-minecraft-game-hack In PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-online_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/pubg-uc-official-price_GM1330123889.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/mcpe-free-download_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/wurst-download_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-for-chromebook-free_GM479516143.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_off000053b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53B0 25560 bytes
SHA-256: d46e62f6edaa3c7e9bd9d3cbe92990fa18016341318a287586d25dffd6c11b73
font_01_sfnt_off00008eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB6 2940 bytes
SHA-256: ae8acc7f13e86db3aed98d7dfb73e70e16f4dedb45e9f0467460b76f54e1a1bb
font_02_sfnt_off000098c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98C4 18012 bytes
SHA-256: aceee9a041b582042c2100ba6115aff943c09cf12b5359888ef7326718d96eb0

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