Malicious PDF — malware analysis report

Static analysis result for SHA-256 9815736f2e7594bc…

MALICIOUS

PDF

34.5 KB Created: 2021-06-28 06:56:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 72a0a561a05efd78403af7e338132166 SHA-1: 94d1f94aaf15f4d2005ec2a12fceca16ae8ed9d5 SHA-256: 9815736f2e7594bce6dacf7d58c3ec0f3ffad1812593e7e7a8c91af5a5030a7b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external sites, including a known malicious redirector at http://netcdn.co/app/431946152/free-robux-no-verification-ios-game-hack. The document body and heuristics indicate a scam related to free game currency or hacks, likely intended to lead users to potentially malicious downloads or phishing pages. No scripts were extracted, but the embedded URLs and link farm structure are strong indicators of a malicious lure.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-no-verification-ios-game-hack In PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/minecraft-free-school_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-jailbreak-free-bugatti_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/kengit-films-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-boss-mania-hack_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-candy-roblox-script_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-for-kids-easy_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-hack-higher-rank-in-group_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-cp_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-cheat-in-roblox-speed-simulator-2_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/can-i-get-robux-for-free_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_off00002fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE2 22364 bytes
SHA-256: 6344353ed439c7128fc0c7c6d563b24ea61f7ac5384d32e22025bdc70d3f4dcd
font_01_sfnt_off0000619d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619D 19072 bytes
SHA-256: 74aa240d54635efe86a0bbc593dd1f0ff6de2607064c28d4fc1fe27d9b448028

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