Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d8ae81afbb9c28…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 11:05:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 423530ea35981d0aea5d0da28cc291af SHA-1: e350e2b1d274cd21a8def9863d346240a9c7b4da SHA-256: 54d8ae81afbb9c2855c2101f7ddab00f19ba6df68ef9620ff931737670a366a6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free in-game currency or hacks. The primary URL, http://netcdn.tw/app/406889139/50-000-free-spins-coin-master-game-hack, is identified as a malicious redirector. The document body, though partially corrupted, contains text related to these lures and embedded URLs, indicating a phishing or scam attempt.

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/406889139/50-000-free-spins-coin-master-game-hack In PDF document text
    • http://www.hlad.hr/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/hack-web-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-any-gamepass-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/tiktok-free-auto-views_GM835599320.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/why-does-roblox-servers-shutdown-when-cheat-engine-is-on_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-hack-in-roblox-easy_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-use-the-cheat-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/top-free-commands-in-roblox-which-works-in-all-games_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-do-the-sex-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/como-ser-hacker-en-roblox-atravesar-paredes_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-scripts-roblox-voidacity_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-codes_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
font_00_sfnt_off00003218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3218 23456 bytes
SHA-256: a4d057083b7b3ea1ee796d93319b5a7ca3c68981bcc60848bb70c309f4bad540
font_01_sfnt_off0000671b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671B 18480 bytes
SHA-256: f050a5cb8527be99d3c3e84738d571a41e36df8bd1ad63ca537930e630161d23

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