Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8de339f55ff3b9…

MALICIOUS

PDF

48.4 KB Created: 2021-06-09 09:53:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bd15ea2fab718e3e1dea7b752e922365 SHA-1: 3131dbcd193ab6aae13db295510d5744e2759e5f SHA-256: 6e8de339f55ff3b99e98cc060fe64e70b1c2bd1eb06a340bc18c7c693da4d03b
260 Risk Score

Malware Insights

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

This PDF document employs a lure of free game currency ('Robux') and presents a fake CAPTCHA to trick users into clicking malicious links. The embedded links redirect to known malicious infrastructure, suggesting the primary goal is to lead users to potentially harmful websites or download further malware. The document's structure and content strongly indicate a phishing or scam attempt designed to exploit user interest in online games.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.
  • 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.
  • 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.tw/app/431946152/how-to-get-free-robux-without-human-verification-on-pc-game-hack In PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/getrobux-come_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-roblox-executor_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/can-i-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/level-coin_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C7 30572 bytes
SHA-256: 40dd3bb2a24611667236a74c0ab25bc465d684eb0b3b531957ed17f8e46d05cb
font_01_sfnt_off00009765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9765 19544 bytes
SHA-256: 6dc1e387b7a4150b932b9212fb000d6881bebdf2b3fd2dfc00977df39d7fe863

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