Malicious PDF — malware analysis report

Static analysis result for SHA-256 4480b581ecfb1640…

MALICIOUS

PDF

50.2 KB Created: 2021-06-10 14:07:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5cd9091987f1f7a11b1a835ada634fe3 SHA-1: 0cbb6a44860a8ea9b2e39792e17abdb73356eafe SHA-256: 4480b581ecfb1640199dffc49d1da3b85d217f60b0b353c8a7a345720edaf66a
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector infrastructure, specifically promoting 'free game hacks' and 'robux generators'. The primary lure URL is https://netcdn.tw/app/431946152/free-robux-no-scam-or-survey-or-hack-game-hack, which is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to trick users into visiting malicious sites, likely leading to further malware downloads or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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/free-robux-no-scam-or-survey-or-hack-game-hack In PDF document text
    • http://katalog.gemalibrary.net/repository/pubg-uc-hack-season-9_GM1330123889.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/worst-client_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/game-guardian-roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/what-is-wurst_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-bonus_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-minecraft-bedrock-server-hosting_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_off00005289.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5289 29992 bytes
SHA-256: abe091107b69bf26aba677e4a56c1f5e2686205675e2efc1996fe2e6b78b0f26
font_01_sfnt_off000095c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95C5 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB0 18968 bytes
SHA-256: d40fa5593ab1852d5871a4b2370810b0cf781b7ee3b0ec4c6e10cbf1d3ceaa7f

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