Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b04b777884612d8…

MALICIOUS

PDF

46.2 KB Created: 2021-06-11 13:10:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 90e6b6fee1903fb5dba4f3cdfbf55011 SHA-1: 0a7da529803128cf413f41b9a754324dfdc5923c SHA-256: 0b04b777884612d89c30fc8e4b681013572683688006b98ff08ccedb00f2ac84
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, disguised as generators for in-game currency or hacks. The primary lure is 'free Robux', a common phishing tactic. The document body and embedded URLs strongly suggest a social engineering attack aimed at driving traffic to potentially malicious sites, which could lead to credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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 https://netcdn.tw/app/431946152/free-robux-card-generator-no-human-verification-or-survey-game-hack In PDF document text
    • http://uristdona.ru/images/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://uristdona.ru/images/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://uristdona.ru/images/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/unlimited-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/get-free-robux_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://uristdona.ru/images/coin-master-hacks-reddit_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/roblox-data-breach_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EFB 23564 bytes
SHA-256: 4231f2bf7600bcb648b18536a68db1405484a722cccca3548a0ee1aeca2104d7
font_01_sfnt_off0000846a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846A 2956 bytes
SHA-256: bab8933fc39dc331bc4c1c904a82b1432ab2e02478fa0a59453c98c5c231da8d
font_02_sfnt_off00008e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E89 19328 bytes
SHA-256: 384a07ae8b17693962ca74fc0881029532268de4402346c7353dafb2c0634cee

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