Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e12d8e51eeeacc…

MALICIOUS

PDF

34.5 KB Created: 2021-06-28 05:22:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ee8f0d82d24757abd18508331622863d SHA-1: 439bccb2776aea11191c5341e580dffe034ac705 SHA-256: e3e12d8e51eeeacc95616ef8a5263c8d0647fb947c8bdd7e9aabbfa2b2867dd9
180 Risk Score

Malware Insights

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

The PDF document contains multiple links to websites offering 'free gamepasses', 'free robux', and 'hacks' for Roblox, which are common lures for malware distribution and phishing. One of the embedded URLs, http://netcdn.co/app/431946152/roblox-script-free-gamepasses-game-hack, is identified as a malicious redirector. Another URL, http://183.91.70.11/repository/how-to-free-robux_GM431946152.pdf, uses an IP address, indicating a potential attempt to bypass domain-based detection. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/roblox-script-free-gamepasses-game-hack In PDF document text
    • http://183.91.70.11/repository/how-to-free-robux_GM431946152.pdfPDF link annotation
    • http://183.91.70.11/repository/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/bloxburg-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-abs-tshirt-roblox_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-roblox-games-for-pc_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/whatis-the-best-free-roblox-script-executer_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/descargar-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/7-year-old-roblox_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/roblox-free-folower-nov-2021_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/grief-hack-roblox_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/robloxhacks_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/150-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/roblox-hack-for-4-500-robux-inspection-code_GM431946152.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_off00002ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA4 22508 bytes
SHA-256: 36e386c8afc48b0a3c623f014f15021cf812c7bd3d6d78e6cd32bbac6a82f5e0
font_01_sfnt_off00006111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6111 19312 bytes
SHA-256: 6c20165293b2b1be8042804715b0b7bec17b3ed86480e156e1dbd427eb34a31b

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