Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcfdcfee53cb52d…

MALICIOUS

PDF

41.0 KB Created: 2021-05-17 02:18:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 19b72e07ad8e00645a05f1db71359ba7 SHA-1: 55fa234bcef05ab1a7145f2717ca986a8fee1960 SHA-256: dfcfdcfee53cb52d940461580455aaa8c7c1b40672ff57b7e05b00579c3d4ba0
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into clicking links. These links redirect to external websites, such as the identified 'free generator / game hack' URL, which is indicative of a phishing or scam attempt. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious intent.

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/is-roblox-studio-free-game-hack In PDF document text
    • https://enpav.it/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://enpav.it/images/woman-roblox_GM431946152.pdfIn PDF document text
    • https://enpav.it/images/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • https://enpav.it/images/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • https://enpav.it/images/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • https://enpav.it/images/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://enpav.it/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://enpav.it/images/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://enpav.it/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://enpav.it/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://enpav.it/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://enpav.it/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://enpav.it/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://enpav.it/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://enpav.it/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://enpav.it/images/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://enpav.it/images/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://enpav.it/images/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://enpav.it/images/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • https://enpav.it/images/roblox-play-as-guest-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_off00004410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4410 24892 bytes
SHA-256: 89761b4b983050f42cbbad0a7187d5499defd1981f331a87a50722f8e4427c3e
font_01_sfnt_off00007cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEC 18484 bytes
SHA-256: 8c5b4094469af548f1fa9842e12df6aaf158939a09e061110ae6a0a8023b94b8

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