Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ede6faa6f099e9…

MALICIOUS

PDF

45.4 KB Created: 2021-06-13 22:51:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 95a5b9b3b09eee2f7d38f5268178b5ee SHA-1: abb10716d5b27ce6c2ea90f2fadc554d29187d4c SHA-256: d8ede6faa6f099e926129366cc6bebebd385271d32170f5e644d7e8d0f32d5a6
222 Risk Score

Malware Insights

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

The PDF contains numerous links disguised as game hacks and generators, impersonating brands like eBay and Roblox. It also presents a fake CAPTCHA to trick users into interacting with the document. The primary malicious URL identified is http://netcdn.co/app/431946152/roblox-bubble-gum-sim-best-pet-free-game-hack, which likely serves as a landing page for further malicious activity or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.co/app/431946152/roblox-bubble-gum-sim-best-pet-free-game-hack.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://netcdn.co/app/431946152/roblox-bubble-gum-sim-best-pet-free-game-hack PDF link annotation
    • https://pustaka.widyakartika.ac.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-hack-roblox-speed_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-offers-for-robux-today_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/toolbox-mod_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-roblox-accounts-2021_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_off00004950.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4950 24544 bytes
SHA-256: 52eff4f4a6f19494f567bf83aaffe120e2c1d30d417ff2ffec743aa7d5036b8b
font_01_sfnt_off00008120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8120 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC8 18728 bytes
SHA-256: 331d8fe6f3e982d21b6b7e5177426de47116588b758e3f3b5341e1eee93e8f80

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