Malicious PDF — malware analysis report

Static analysis result for SHA-256 996540e7a8e4a827…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 09:06:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: df7fe09892622dfb695ac19d86d97fe7 SHA-1: 2a1d45e3085357e813acfb2473d2ebcfd39942db SHA-256: 996540e7a8e4a827a36c567b1b23a77646e00687143505b749a97d97add00aa8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-spins-today-daily-links-game-hack, which appears to be a redirector to other malicious PDFs hosted on slim.sisminkada.net. This indicates a phishing or scam campaign designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-spins-today-daily-links-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-robux-gratis-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-without-a-human-verification_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-any-account-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/bleu-roblox-exploit-free_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/afk-hacker-roblox-wds_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-hack-account-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-menu-roblox-download_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_002_off00003250.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3250 22704 bytes
SHA-256: d320c164276be222fe0e0dd745de4a6b1cb2a6f35b8401b1a1c4d4dfba45176e
font_01_sfnt_off00006510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6510 18940 bytes
SHA-256: 74e1d82992a432109423c701e24adf08bd24e863db22c1b49c4282e3a69c5270

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