Malicious PDF — malware analysis report

Static analysis result for SHA-256 860aebd3680dc7c9…

MALICIOUS

PDF

46.3 KB Created: 2021-05-17 03:57:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: de935be9655670f30e67bcbaf1708349 SHA-1: 0aeb06f0425fed37fc019de60bdd2e31781a4bf0 SHA-256: 860aebd3680dc7c97f5fffb96f44b03e5e46b6dca36113c4b9582ca5b896e449
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirector domains that host lures for game hacks and free currency, such as Robux. One heuristic specifically identifies these links as leading to known malicious redirector infrastructure. The document body, though partially corrupted, contains text and URLs consistent with these lures, and the presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into performing an action that could lead to a malicious download or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9278

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.
  • 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
  • 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/give-me-free-robux-game-hack In PDF document text
    • http://glll.de/images/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://glll.de/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://glll.de/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://glll.de/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://glll.de/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://glll.de/images/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://glll.de/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://glll.de/images/coin-master-hack-mobile_GM406889139.pdfIn PDF document text
    • http://glll.de/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://glll.de/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://glll.de/images/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://glll.de/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://glll.de/images/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://glll.de/images/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://glll.de/images/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://glll.de/images/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://glll.de/images/free-coins_GM406889139.pdfIn PDF document text
    • http://glll.de/images/coin-master-hack-fast_GM406889139.pdfIn PDF document text
    • http://glll.de/images/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://glll.de/images/free-ways-to-get-robux_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_off000048da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48DA 26036 bytes
SHA-256: adbdcba5a62464558748e5ca6916c8098a340af5e082b7eb3fb580e6bdc5b6b4
font_01_sfnt_off00008548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8548 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000091f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91F0 18444 bytes
SHA-256: 68319dbf483afe81c5a4de3b3f5290fc223d358c0f75f000dd988daf46eb7eae

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