Malicious PDF — malware analysis report

Static analysis result for SHA-256 830ba76a2ccad46c…

MALICIOUS

PDF

43.6 KB Created: 2021-05-13 05:00:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9b3b1615d1d9f9e7de6f02b9529d12ae SHA-1: 8b6fc2c32cfcdaa92a2fef1a795a2d01b162856d SHA-256: 830ba76a2ccad46c985a68264f0aecaf3945d6831d05cfedb3ab05bbd1b32d9b
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is used to trick users into interacting with these malicious links. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an attempt to lead the user to a malicious website, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/win-free-robux-game-hack In PDF document text
    • http://infoagronomia.com.ar/images/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/coin-master-village-3_GM406889139.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://infoagronomia.com.ar/images/play-minecraft-free-online-no-download_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
stream_003_off00004908.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4908 27628 bytes
SHA-256: fd2c8737fac3cc957242bf563ab0f0cf2f3705b61283c2f2120ac1bb2c7eafff
font_01_sfnt_off000087d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D9 18332 bytes
SHA-256: abf0b8ed31f5047ebf3c1463738251345f2a3e8ea43e3f17fb5c5b26bb0b5a7e

Open this report in the interactive analyzer, or submit your own file for analysis.