Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefd0eb166a10ba8…

MALICIOUS

PDF

34.9 KB Created: 2021-06-29 04:34:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 79a677847c500140fb8821d7d8326d70 SHA-1: 143605cd340241c0cff68f34f997405cf701d26e SHA-256: aefd0eb166a10ba8cd113390609f0657be806b8ff498326267fb039cf9858862
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded URLs that lead to a known malicious redirector. The document body and heuristic firings indicate a lure for game-related cheats or currency, such as 'Free Robux' or 'Coin Master Hack'. The primary malicious URL identified is http://netcdn.co/app/431946152/free-robux-meme-game-hack, which is flagged as a malicious redirector. The document's purpose is to entice users to click these links, likely leading to further malware downloads or phishing attempts.

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.co/app/431946152/free-robux-meme-game-hack In PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/free-robux-points_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/thebesian-get-roblox-ninja-animation-free_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/how-to-exploit-with-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/how-to-get-free-faces-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/coin-master-hack-mobile_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://www.bdlh.go.th/ckfinder/userfiles/files/roblox-hacks-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
stream_002_off00002fa7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FA7 22980 bytes
SHA-256: 7438be66a9d4432b24e892b9a2fee6e9f26fde5092eeffc04ca99378fd482355
font_01_sfnt_off00006326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6326 19172 bytes
SHA-256: cc6f39551398ec7556c1100a0df569da4eadcef96f4621f512d193548eed02ae

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