Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb830ff46dfb24f6…

MALICIOUS

PDF

41.4 KB Created: 2021-05-19 18:05:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2e45b0532d174434e851524f2c3a4453 SHA-1: 23d8e8075992c3fc215796db34e0cdbdac98cc7c SHA-256: fb830ff46dfb24f6e20eb8186298fe911c30a37c3bbf81d1392f970ec3d03c80
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are part of a link farm designed to attract users searching for game hacks and free currency. The primary redirector URL, https://netcdn.xyz/app/835599320/tiktok-free-view-like-video-game-hack, is flagged as malicious. The document body and heuristics indicate a lure for engagement with scam content, likely to monetize traffic or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.xyz/app/835599320/tiktok-free-view-like-video-game-hack In PDF document text
    • https://www.only-press.ru/images/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://www.only-press.ru/images/coin-master-mod-version-free-download-2021_GM406889139.pdfIn PDF document text
    • https://www.only-press.ru/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.only-press.ru/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.only-press.ru/images/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.only-press.ru/images/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • https://www.only-press.ru/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://www.only-press.ru/images/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.only-press.ru/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://www.only-press.ru/images/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • https://www.only-press.ru/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.only-press.ru/images/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://www.only-press.ru/images/cpbildco-robux_GM431946152.pdfIn PDF document text
    • https://www.only-press.ru/images/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • https://www.only-press.ru/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://www.only-press.ru/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.only-press.ru/images/easy-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.only-press.ru/images/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.only-press.ru/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • https://www.only-press.ru/images/easypoints-gg-roblox_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_off000048a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48A8 24380 bytes
SHA-256: 3609355b6b4cbcf13f775d485818d7278f7740dc054eeef08d71cb589932f59a
font_01_sfnt_off0000803c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803C 17928 bytes
SHA-256: e597d24e5a41a4fe474e219e212600c01ea77a953e8bb23161974cf4e13c2f17

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