Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd4b1d97c181ef3…

MALICIOUS

PDF

45.6 KB Created: 2021-05-16 12:46:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f30cddb07c698cc7abfbe5d8f860a3ed SHA-1: b08d1565cbfb47948c8627b1dbf30f5c7f10dd8b SHA-256: ddd4b1d97c181ef3eef24667b88335e5df7e5295c11dcabcfc6e56b5b2fa5d8e
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 Robux" or "game hacks" to lure users. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the embedded URLs and the nature of the lures suggest an attempt to drive users to download further malicious content or visit phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.xyz/app/431946152/free-800-robux-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-demon_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/e-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-do-you-get-roblox-money_GM431946152.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_003_off00004adb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ADB 25740 bytes
SHA-256: bbbf934de8e2e8535197aa73c9fc9617acc4cd9874906140a50f60a6d85df4dd
font_01_sfnt_off000085bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85BF 2824 bytes
SHA-256: bd082aa73fbb1a8b3bd2e5c998d3d8e31d1dfc71ea36f846af746f69a0d2ab7f
font_02_sfnt_off00008f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F73 18396 bytes
SHA-256: 2059a7894931e9b75336f5975f03d939213f3fdb926ff7d6db67df9fd1731cb7

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