Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc82102658f4d8e…

MALICIOUS

PDF

42.6 KB Created: 2021-05-20 06:46:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 899394a4591cf6c2ed6c34debee2b115 SHA-1: 8909de2a3aae527c28c18576a697857cdb8de746 SHA-256: afc82102658f4d8e51b97c32630fbd58ec809489e50a68b81f0ee31d67a0d210
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, including one that masquerades as a 'game hack' lure. The document body and embedded URLs suggest a phishing or scam attempt, likely aiming to trick users into visiting malicious sites. No scripts were extracted, but the presence of multiple malicious links and the ML classifier output strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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/835599320/tiktok-free-view-30-detik-game-hack In PDF document text
    • http://cleansui.com.tw/image/data/files/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-support_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/what-games-on-roblox-give-you-free-robux_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
stream_002_off0000468d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x468D 27096 bytes
SHA-256: a9935e94778c7ed4f80cd959ca138329347cb91fac67ff7b52c6d5822d950c28
font_01_sfnt_off0000848c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x848C 18268 bytes
SHA-256: 465263b7eac654f3935d88bb61468a441f9e2769ab45579438ae129d8dd18411

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