Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4211130590ee92e…

MALICIOUS

PDF

47.6 KB Created: 2021-05-14 05:47:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4406dcd773a7e3d0eaaa870f11b65d22 SHA-1: 3415e45401bbe26ec3a702e72c02df8f172109d9 SHA-256: b4211130590ee92e5123b8645751de6b3e7e600296d71f61e6bf5d58eaf99322
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 game hacks and free currency. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure itself contains embedded URLs that are likely used to redirect the user to malicious sites, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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/479516143/can-you-get-minecraft-windows-10-for-free-game-hack In PDF document text
    • http://zercalo.org/images/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://education.minecraftIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A70 23952 bytes
SHA-256: 5cbdad4e768996397a996b94ccf21dbc1201a5d830198093d6527d64a34fb70c
font_01_sfnt_off000080ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80AE 3164 bytes
SHA-256: da0c8ebf328d98c1669c43c21d99cc2a20c7f895d843e7c06d0a5c1695b5c6c9
font_02_sfnt_off00008ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA1 2816 bytes
SHA-256: 4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
font_03_sfnt_off000095b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95B1 18824 bytes
SHA-256: e97784abce896f28fc49a1c6da133f9d06af890cc34ee54f88e57118c544132c

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