Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d19a5531254c59c…

MALICIOUS

PDF

51.1 KB Created: 2021-06-03 16:57:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: be3245a256fbc9ef275cbe104ddf04b7 SHA-1: 3ab084d2f854ae7f880a0a4bdaa78bf593947ef6 SHA-256: 9d19a5531254c59cfdd2d2a2e48be5f28e798ed08fcf96034b9846792bfe72e0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering free game currency and hacks, a common lure for phishing or malware distribution. The primary link, 'https://netcdn.online/app/431946152/how-to-get-20210-robux-for-free-game-hack', is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

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/431946152/how-to-get-20210-robux-for-free-game-hack In PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-group-roblox_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-net_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/robux-rewards_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5035 26056 bytes
SHA-256: 2db60385ed24fc4c8609792680050b3fd964ae0342ebb836e292a96a3cf23525
font_01_sfnt_off00008c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6B 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9650 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA362 18684 bytes
SHA-256: 6e9c0eecafd635f65838c8dbfb1e23e8457e4c9239d4b33e445d621fd980b18f

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