Malicious PDF — malware analysis report

Static analysis result for SHA-256 90312f47e4e8bd84…

MALICIOUS

PDF

45.4 KB Created: 2021-06-07 08:38:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 570ebda2fc814adee8f5e4687550a4fd SHA-1: 5427f80ccabffdb26f1e06dcdf1697f6bb4a8370 SHA-256: 90312f47e4e8bd84d118c88c43702f099a8c1e5583c622840806ecf23c670a08
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering 'free generators' or 'hacks' for popular games, which is a common lure for malicious content. The ML classifier also flagged this PDF as malicious. The embedded URLs, such as 'https://netcdn.tw/app/431946152/25-free-robux-game-hack', are likely entry points to further malicious downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/25-free-robux-game-hack In PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/oginject-co_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/hack-in-booga-booga-roblox_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-robux-group_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/work-at-pizza-place-roblox-hack_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000512d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x512D 26724 bytes
SHA-256: 83eac4e44c6a326bfa59d149d97d6e74e9ecbdf1acc069ab9fef9aa4d0c23a57
font_01_sfnt_off00008ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ECD 18272 bytes
SHA-256: 13573d1ea0a3709827097a2fadec1683edbbb0ca986ca0c29386cc046ff86e11

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