Malicious PDF — malware analysis report

Static analysis result for SHA-256 244ea7b4b18941a5…

MALICIOUS

PDF

34.9 KB Created: 2021-06-29 01:53:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f0eedf96f2354d1a69e01056c91b578c SHA-1: 83b8fec2d3be8e7560523643d56a1e400116b303 SHA-256: 244ea7b4b18941a5932681426554ff73cafa16b31cd56de11c71501c4818732a
200 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 and IP addresses, disguised as offers for free game currency and hacks. The document body and extracted URLs strongly suggest a lure to a site that likely hosts malware or phishing content. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/free-robux-script-pastebin-no-wait-game-hack In PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-no-human-verification-2021_GM431946152.pdfPDF link annotation
    • http://202.56.165.220/digilab/repository/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-to-hack-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-pinewood-hack_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/can-u-get-hacked-buying-robux-on-your-debit-card_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/cool-free-roblox-clothing_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/download-game-roblox-hack_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/all-ways-to-use-cheat-engine-in-roblox_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/robux-hack-download_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/focus-points-hack-roblox-dybo_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-free-lvl-7-script-executor-2021-august-2021_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-equipment-roblox_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/discord-de-774-roblox-hack_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-dominus-site-robloxcom_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-shields-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
font_00_sfnt_off00003130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3130 22132 bytes
SHA-256: 0b280f0e4ce382a65b93c0dee8a4cdad495bfa0fb244d8c58c2e1984aa90bf4b
font_01_sfnt_off00006242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6242 19468 bytes
SHA-256: b9a7e7be460bba4b39aa14e26db38036ea2badee0876058805eccfb1a57f8117

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