Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05f950663a3b8e3…

MALICIOUS

PDF

41.6 KB Created: 2021-05-11 16:30:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5bdc36aec98c569e98ea61c11bbdd031 SHA-1: 73e19481fe9e35e689929514a644271c5a6fc7b9 SHA-256: a05f950663a3b8e3bdf9e4bd834ed7c85e741f82ac7f8495d8c6cc8542449e77
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to entice users into clicking a link. The link redirects to malicious infrastructure, likely to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness, and the presence of multiple redirector links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/mathep-game-hack In PDF document text
    • http://maslabaou.com/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://maslabaou.com/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://maslabaou.com/images/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/robux-redeem_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://maslabaou.com/images/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://maslabaou.com/images/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://maslabaou.com/images/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://maslabaou.com/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://maslabaou.com/images/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://maslabaou.com/images/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/free-robux-now_GM431946152.pdfIn PDF document text
    • http://maslabaou.com/images/how-to-get-roblox-credit-for-free_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
font_00_sfnt_off000048fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48FE 24568 bytes
SHA-256: b37ae007b21973b5d7638e0c07108434a95d1581c4c9bb3fa3aebd58fd611596
font_01_sfnt_off000080f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80F8 18068 bytes
SHA-256: 2b3a9c081553d581a827df65dee23cc3b514f38b63125b20306762026e644864

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