Malicious PDF — malware analysis report

Static analysis result for SHA-256 da55837a53d7c8d0…

MALICIOUS

PDF

43.2 KB Created: 2021-06-03 09:15:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 215c12a9eb680fd4a511c7e46919c933 SHA-1: 2836233b1d49dc98a7634802e93b363a8ef85a6b SHA-256: da55837a53d7c8d048ff2d3fc119568392a31f6fd8caa5ec7e1db0a7c4bb40ef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a "free generator / game hack" lure, identified as malicious infrastructure. The document body and extracted URLs strongly suggest a social engineering attempt to trick users into visiting potentially harmful sites. While no scripts were directly extracted, the nature of the lure and the embedded URLs indicate a phishing or scamming attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-spin-cheat-game-hack In PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-tiktok-comments_GM835599320.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-claim-spins_GM406889139.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_004_off00005164.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5164 23888 bytes
SHA-256: a6402701db349fbf0aee59a25b7cc2d236d4b9c061967a300742bf17d627ee01
font_01_sfnt_off00008738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8738 17888 bytes
SHA-256: 6e952cda52cab557889c44e050e091d78c8f903a1a78f0754c4b08395fb72fca

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