Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85aa1a2b49363f3…

MALICIOUS

PDF

50.5 KB Created: 2021-06-03 12:48:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 98adcec314d225cffd8618927e59f031 SHA-1: 8e8db40984dd5e09051a5ac1d4b9f0c7b8b41880 SHA-256: e85aa1a2b49363f3435b0573b27c509d734bc2ef90c47f3de8b5a7112e0af32d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generator / game hack' lures. The primary malicious URL identified is https://netcdn.online/app/431946152/how-to-get-robux-easy-game-hack. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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/how-to-get-robux-easy-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/pokemon-go-hack-free-coins_GM1094591345.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-spin_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D0 25012 bytes
SHA-256: 476993072d83f0483852a37d7bea251da6d7191c7564e3dbf812e839d0113240
font_01_sfnt_off00008aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEA 2844 bytes
SHA-256: d4efd49219a7ff6424c923a6ccef5b7e1750ded18bbd79546f2ad196ddc76c43
font_02_sfnt_off000094a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94A5 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_03_sfnt_off0000a14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA14D 18528 bytes
SHA-256: b9e2aa841985fb83527df95ccd87a01b1af2ca35417b0d42f05b7d7a63821dbf

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