Malicious PDF — malware analysis report

Static analysis result for SHA-256 03819378b82cb868…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 12:37:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3a2ea634f14c1d9ac4ff7b079f0ba065 SHA-1: 4a637bd6c110983b71dcec5d4251781f22bfc1bf SHA-256: 03819378b82cb868db533e503a1f2b159591cad019fbda6730377ab54e884b18
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF files. The primary lure appears to be related to 'free game hacks' or currency generators for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or spamming operation. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/how-do-you-get-free-daily-spins-on-coin-master-game-hack PDF link annotation
    • https://www.insol-europe.org/uploads/files/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/i-need-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-hack-any-roblox-account_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ede.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EDE 24772 bytes
SHA-256: 22c459bdc4454a7c94a0b556232625c64a75bb3b6757cbe16f022a0893f1156a
font_01_sfnt_off000086d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D3 18772 bytes
SHA-256: 74c8ba82529a8264da82a13379fa888a972f1f638ac6a02f632c6eace9a001bf

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