Malicious PDF — malware analysis report

Static analysis result for SHA-256 545da8bb253e6083…

MALICIOUS

PDF

45.1 KB Created: 2021-05-11 20:33:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fa6d5a8a645586df46ebf6dfa527febf SHA-1: 95735fa2ba41b55a8b5957b01093e75898347af1 SHA-256: 545da8bb253e6083beb49ed248a136b3e0ec61c1acc15b47c1e641b728447b8a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting "free generator / game hack" lures. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of malicious redirector links and the lure content strongly suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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 https://netcdn.xyz/app/406889139/free-coins-coin-master-no-human-verification-game-hack In PDF document text
    • http://winnerwater.com.tw/image/data/files/spin-coin_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-robux-download_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/no-robux_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/fbchampion_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-robux-app_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b10.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B10 25604 bytes
SHA-256: 522c4e3bff2f859a0944417350915d8c8b11bd862ccadcdcedd0ccff1773027f
font_01_sfnt_off0000845a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x845A 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off00008dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFA 18244 bytes
SHA-256: 01d63b1d73aa8bf8d24c0c61ee418a5c78711e36496b8284aaee89190376465e

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