Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c71ebc294f8bb6b…

MALICIOUS

PDF

43.7 KB Created: 2021-05-15 07:05:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 780ee7aa06bc26283241af53140cac34 SHA-1: 3c5a9ae862a26eccf14c777507e376f5c2499e6d SHA-256: 7c71ebc294f8bb6bffb3f3e4796f0a431318b11141fa2ecf2e13bd00cfdca7f6
200 Risk Score

Malware Insights

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

The PDF contains multiple links to a redirector URL that impersonates Microsoft and offers "free Robux codes generator" or "game hacks". This lure is designed to trick users into clicking, likely leading to credential phishing or the download of a second-stage payload. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-robux-codes-generator-no-verification-game-hack.
  • 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-codes-generator-no-verification-game-hack In PDF document text
    • http://www.homesweethome.pl/images/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/get-robux_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/mcpe-download_GM479516143.pdfIn PDF document text
    • http://www.homesweethome.pl/images/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-free-spins-hack-iphone_GM406889139.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_off000049a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49A3 27124 bytes
SHA-256: e57e1d24eefa4264e741a09dcf4e1b6cfbc852e2bbcbf8718358c482a8807ed8
font_01_sfnt_off00008716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8716 18776 bytes
SHA-256: a4a7f46a8ec4e4fe0089faa119d4be48f59112184e2c655defb35f5102acccee

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