Malicious PDF — malware analysis report

Static analysis result for SHA-256 082f730f721838ec…

MALICIOUS

PDF

45.0 KB Created: 2021-04-30 18:44:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c8be2b66eeff8d7646811513cfefa5e0 SHA-1: 873bacfedb2a9a6cd14da21e721fd2c1cccbe9a1 SHA-256: 082f730f721838ecb20efa993058a6a89e7e086027001e44cfb5c7d53d99c33d
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector, under the guise of game hacks and generators. The heuristic firings indicate a lure for game hacks and a malicious redirector, along with a fake CAPTCHA prompt to trick users. While no scripts were explicitly extracted, the nature of the links suggests an attempt to lead the user to a malicious site for further exploitation or download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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/big-brother-hacks-roblox-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/hack-roblox-exploiting.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/hello-neighbor-free-play-in-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/mediafre-roblox-hack.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-free-robux-codes-2021-wiki.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-accounts-2021-september.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-robux-hack-without-survey.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-catalog-free-headphones.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hack-roblox-using-lucky-patcher.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/cheat-codes-for-dungeon-quest-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-cheat-engine-for-robux-2021.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_off00003fb5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3FB5 29496 bytes
SHA-256: b708e0f63f88c4d9cb837dcbbf2b875c3f0c6e6a5b352aacfc7f35f73d324061
font_01_sfnt_off00008280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8280 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00008c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C42 18860 bytes
SHA-256: b522afbec9081326ce553c6b6ed48adcb0d542106ae750a22b6e10cfa96cdd66

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