Malicious PDF — malware analysis report

Static analysis result for SHA-256 25255ac11bf13ead…

MALICIOUS

PDF

33.7 KB Created: 2021-06-19 05:20:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3e089a4671f89691ae4cc0e88a4ed5ed SHA-1: d9a489aeb0758289564fda992c4c0261b873549a SHA-256: 25255ac11bf13ead0a8d3127494d173a68e47524cd623a7d1f1f8d327dc6e9de
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector, which in turn likely serves further malicious content. The document body explicitly advertises 'free Robux' and 'game hacks', aligning with the malicious redirector's apparent purpose. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.co/app/431946152/easy-way-to-get-free-robux-on-roblox-2021-game-hack In PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-arsenal-hacks_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/100-robux_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-hack-legit_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/code-free-robux_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-free-link-app_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_off00002d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D2C 21536 bytes
SHA-256: ab93ae27412e3ec8d3cfb3e570690e5a60b84fa653b93ef2abe9184d22b99829
font_01_sfnt_off00005c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C68 19672 bytes
SHA-256: 512be24595692201713a0b140197b1b2825b5164da9a46439b316f651e6fd3c8