Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b24766112033ba…

MALICIOUS

PDF

42.8 KB Created: 2021-05-10 18:00:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a9b92e6b62f628d09668d31847a91407 SHA-1: 22c78306c9486e350c090a4a189eace20ddf0dc6 SHA-256: 28b24766112033baa54e68d9b3deb522a526036e89aede4b6b9cf8b536b1037e
208 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to what is identified as malicious redirector infrastructure, specifically targeting users with lures related to game hacks and free in-game currency. The document body explicitly displays a fake CAPTCHA and a call-to-action button, reinforcing the lure to click the embedded URLs. These URLs likely lead to further malicious content or exploit kits designed to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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-roblox-hair-to-wear-game-hack In PDF document text
    • http://huebner-baustoffe.de/images/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-hack-apk_GM406889139.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
font_00_sfnt_off000041ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41EE 24632 bytes
SHA-256: c0e9378d58ddb5ae4f204fa23e3a51bc621729478de94e7566e012d1e8b5f08a
font_01_sfnt_off00007a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9B 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8485 18496 bytes
SHA-256: adf075a740c6f928a3b94d4aeef99adcd15710aa40e26859f6513b600edf11fb

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