Malicious PDF — malware analysis report

Static analysis result for SHA-256 5145a278f031c548…

MALICIOUS

PDF

35.8 KB Created: 2021-07-04 04:46:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e18cc08bc8262210c38f4b494ebde52f SHA-1: 36ac495e2a5222da6a29c82509bf8bce8094ad74 SHA-256: 5145a278f031c5480f396237087ad9adc7e019f436854c0edfb7a3ab9949d2e8
200 Risk Score

Malware Insights

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

The PDF document contains a lure for free game currency, directing users to a malicious redirector. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is presented to trick users into interacting with the malicious link. The embedded URL is likely part of a chain to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/how-to-get-free-robux-without-downloading-anything-game-hack In PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/roblox-wall-hacks-2021-script_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-robux-hack-no-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/best-way-how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/royale-hich-dimond-hack-2021-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-roblox-account-with-robux-password_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://www.e-starmagazine.com/uploads/files/minecraft-java-server-hosting-free_GM479516143.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
font_00_sfnt_off0000322b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x322B 22380 bytes
SHA-256: 2bbb511c43578b5cbfe0f54465a4d3f798d48bfa41d365801fee569494f96130
font_01_sfnt_off000063c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C9 20064 bytes
SHA-256: b16c0b2685476b12d790c98b25c02402c4aa59cc1950d8e2b4913e5425ac04b7

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