Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d291cd054c89f9f…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 21:19:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a44608b55d4befee3a58fad41a168ea7 SHA-1: 099fad1d23bb94660d7cd0d5f59a76656266e757 SHA-256: 0d291cd054c89f9fe1d9dd836cddc96353d803ca4d195f21c3c2ab5e7a3754dc
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and sites offering game hacks and generators, specifically for Robux and Coin Master. The document body, though partially corrupted, indicates a lure for 'free Robux codes'. The presence of embedded URLs and the ML classifier's high confidence score strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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-free-robux-codes-game-hack In PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-e-free_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f00.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F00 24584 bytes
SHA-256: 70e25190a0a39efb8a96646b41dc3d459c34300c333d9b7b4b78710dca32d4e2
font_01_sfnt_off000086f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F8 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off000090a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90A7 18456 bytes
SHA-256: 647704a1f8ac96c456e26df3796ee2ada4959e42324ca69004a5f2968b1e2bf7

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