Malicious PDF — malware analysis report

Static analysis result for SHA-256 31aa15433068bbc5…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 10:32:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6c0ebdb44b1471cc3638111ea59d1ffd SHA-1: e8e1e102378e1772f80e848858129cc0348b1630 SHA-256: 31aa15433068bbc55de45b4fdf5cdddddbdd4ebec06e07bb44db934a102a143e
200 Risk Score

Malware Insights

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

This PDF document employs a lure related to 'free Robux' and impersonates Facebook to trick users into clicking a malicious link. The link directs to infrastructure known for malicious redirects and is associated with credential phishing. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest an attempt to exploit users through social engineering, likely leading to credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/is-there-any-way-to-get-free-robux-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.online/app/431946152/is-there-any-way-to-get-free-robux-game-hack In PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/whats-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/public-enemy-sun-prairie-coin-master-free-spins_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
font_00_sfnt_off00005133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5133 26080 bytes
SHA-256: fc2042fef73a53e620cae393e5402fe9e0c42a4247398d77840098dab0fb3227
font_01_sfnt_off00008e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E08 18892 bytes
SHA-256: d4b621edf5ac5f073c5a65dd804db4f1f2ad13c123c1b5ace541ce5f5c284f58

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