Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8ce12c8c2df8c3…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 15:58:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fe6fb471037d646d868606ef969c5e46 SHA-1: 4b006bd06a923d4424bd6d38406e1b23301bf321 SHA-256: 1d8ce12c8c2df8c3948c8ce015b491a953230f0e1855aa87d35a2ee9daed7170
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector hosted on 'netcdn.tw', which is flagged as malicious infrastructure. The document body and embedded text suggest a lure for game hacks and free currency, a common phishing tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern involves redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-hacks-reddit-game-hack In PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/how-to-use-inspect-element-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/can-pubg-uc-be-hacked_GM1330123889.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/grab-points-login_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/roblox-whatever-floats-your-boat-hack_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/roblox-free-gamepass-script_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/roblox-free-robux-obby-working-100_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/tiktok-free-cuthbert_GM835599320.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/free-robux-promo-codes-2021-march_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/when-nerd-sees-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/hack-robux-infinitos-en-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/how-to-get-red-glowing-eyes-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://www.advancedcube.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-verification-2021_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_off00003314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3314 23280 bytes
SHA-256: 600f5b7c04184db0930ae7eb125ad6c20157f198b8a2f05ed2756c8393c5c403
font_01_sfnt_off000067a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A2 18180 bytes
SHA-256: 1081114b10febab216a61b4f0b1df1cdc7084fd57e5266ca6a1d4599479f230d

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