Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f59f7b329b0e8c5…

MALICIOUS

PDF

44.7 KB Created: 2021-06-09 10:07:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ea1ff7f0c219cf2966cb628a12c91cf4 SHA-1: 3e5d5e56bf154712c7d413305c7722ada0fbc39d SHA-256: 6f59f7b329b0e8c5c4ede048d197703f9b5580f2174e9931d808a53b1f60dc52
220 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a fake CAPTCHA lure. The document body, though heavily obfuscated, appears to be related to game hacks and gift cards, aligning with the lure. The embedded URLs point to a redirector and an IP address hosting further PDF files, suggesting a multi-stage attack designed to trick users into downloading additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/roblox-gift-card-redeem-free-game-hack In PDF document text
    • http://202.56.165.220/digilab/repository/free-coin-spin_GM406889139.pdfPDF link annotation
    • http://202.56.165.220/digilab/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/robux-2021_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/pubg-uc-meaning_GM1330123889.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/mcpe-com_GM479516143.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-images_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/games-that-can-be-hacked_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/freespins-coin-master_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_004_off00004f3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F3B 25432 bytes
SHA-256: 5cc44a4cf5b3c347b6ab3e47d9de2084f8e8e7afba86d156f922d5f9610297b7
font_01_sfnt_off00008a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A68 18836 bytes
SHA-256: 8afed543cef1108f9cbc3a4a48c5e00760899d5a198a6651aab6f6b097d5ba57

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