Malicious PDF — malware analysis report

Static analysis result for SHA-256 0531b2b3a6c55854…

MALICIOUS

PDF

47.9 KB Created: 2021-06-03 07:38:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 43eb70c52fde101b454b54084b9a3915 SHA-1: 1c1e56d02b8d8ac1777872ee258360a433c4c0d8 SHA-256: 0531b2b3a6c55854b6957bcdd6116d63da25baea65a8f47bf9bcbfb39abdba28
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure for "free Robux" or game hacks, aligning with common phishing and scam tactics. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/free-robux-hack-no-verification-game-hack In PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/real-working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F5 25076 bytes
SHA-256: b58c67f6ca3928e801af86262f18b64dc195163d79b1649afcc4c2ac9a2d047b
font_01_sfnt_off00008a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6D 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9714 18772 bytes
SHA-256: 87cd01898e0c435f6b8e3fdf3db31fb3453f40f32176463e71dafc861d9bd3f7

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