Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d1bd36d664b0dd…

MALICIOUS

PDF

43.6 KB Created: 2021-05-13 05:07:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 42a08c2c068f6e70877f698ba74eea73 SHA-1: 6c19b5aacfc4d0efb1ad2e21f64fc09c7c5d3644 SHA-256: c4d1bd36d664b0dd63ebeb5066e4b06617653167f355ce26b17b384672c01eb4
240 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA, likely to trick them into downloading a second-stage payload. The document also contains instructions to disable security software, indicating a high-risk malicious intent. The primary lure is related to 'free Robux' and game hacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/free-robux-no-verification-needed-game-hack In PDF document text
    • https://www.air-shop.cz/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.air-shop.cz/images/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://www.air-shop.cz/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://www.air-shop.cz/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.air-shop.cz/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.air-shop.cz/images/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • https://www.air-shop.cz/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.air-shop.cz/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.air-shop.cz/images/10-robux_GM431946152.pdfIn PDF document text
    • https://www.air-shop.cz/images/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • https://www.air-shop.cz/images/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • https://www.air-shop.cz/images/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.air-shop.cz/images/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.air-shop.cz/images/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • https://www.air-shop.cz/images/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.air-shop.cz/images/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://www.air-shop.cz/images/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.air-shop.cz/images/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • https://www.air-shop.cz/images/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • https://www.air-shop.cz/images/robux-free-online_GM431946152.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_003_off000046ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46AD 28072 bytes
SHA-256: 7813b0c93e7c21f3ef943b3c5d660f62082887b217d982bd774f6d9bda191bea
font_01_sfnt_off0000866a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866A 18776 bytes
SHA-256: d142001b9e8124b93d34dd5eb493ac1502906b177ba9fa7077e4038994baf40d

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