Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82f37f8fc481d7b…

MALICIOUS

PDF

46.4 KB Created: 2021-06-03 12:22:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1409dabc5891db8254ed0f55d07d3cf8 SHA-1: ba7eeadc88eb85aea2ec3e91531439db676aedd9 SHA-256: a82f37f8fc481d7b467a1b62e87f480527bc451366466391a35f2b29c0951939
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of free in-game currency and hacks to entice users to click on embedded links. The primary link, https://netcdn.online/app/431946152/free-robux-no-human-verification-or-survey-game-hack, is identified as a malicious redirector. The document's structure and embedded links suggest an attempt to deliver a secondary payload or redirect users to a phishing or malware distribution site. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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-no-human-verification-or-survey-game-hack In PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/master-coins-free_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-coins-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/minecraft-free-download_GM479516143.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_off0000543f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x543F 26128 bytes
SHA-256: 4c463c63288d969eb173d9c47d593bb954df29e08cd03daaf6762637f646c5b2
font_01_sfnt_off0000901f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x901F 19156 bytes
SHA-256: 67fe8f54727a48f1cd96414783693fce3a40c8eaba0da55a0542d393d9c1d7aa

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