Malicious PDF — malware analysis report

Static analysis result for SHA-256 6850c395d13566d9…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 07:05:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 550e8ac26099b29bfd26b74397b0fdae SHA-1: 310e89eac71a2d859de07a936c2124513540221f SHA-256: 6850c395d13566d9b18ab2cf9d70857175fea85a5d897b3a38f572a1f5138529
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector infrastructure, specifically advertising 'free generators' for games like Coin Master and Roblox. The document body and heuristics indicate a lure for users seeking in-game advantages, which is a common social engineering tactic. No scripts were extracted, but the presence of malicious redirector links strongly suggests the intent is to lead users to potentially malicious websites for further exploitation or credential harvesting.

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/real-coin-master-hacks-game-hack In PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/free-roblox-exploit-level-7-olimpois_GM431946152.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/free-coin-spin-daily-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/rbx-robux_GM431946152.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/free-followers-generator-roblox_GM431946152.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/roblox-create-free-vip-servers-scripting_GM431946152.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/free-robux-hack-2021-download_GM431946152.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://www.lbhbali.or.id/new/public/ckfinder/userfiles/files/cute-free-roblox-clothes_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_off00003228.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3228 22632 bytes
SHA-256: ef2b38e2253804603809ba598b85c66f8d0d66042722fe12540f9ec3ad0c6398
font_01_sfnt_off000064eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EB 18080 bytes
SHA-256: 8036c31bb1dfaeb579433bf8ca502beca93f54135728b4f3b0b6b4a98295ab57

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