Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1b45858acd04eb…

MALICIOUS

PDF

45.1 KB Created: 2021-05-15 08:32:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 719055fdf061e5f1d090cd80298b71b6 SHA-1: 204d2ace74f2a9da59b0fa07006d507c0ae6ab3b SHA-256: 5e1b45858acd04eb983cc774a3484a2c9ea86f00d42f9c8fd92d147875ee3d47
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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.xyz/app/479516143/minecraft-server-hacks-game-hack PDF link annotation
    • http://www.fabbrotorino.eu/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fabbrotorino.eu/images/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://youtuIn 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_003_off00004b1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B1F 25396 bytes
SHA-256: d8b83a8d7f6aa40caa59af42c590aed34d07a958819bb68198d85e0cd96f8502
font_01_sfnt_off000085a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85A7 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F58 17852 bytes
SHA-256: d08e9f99218473ecffc4f3e4fddc043c571e48cf04331ee5ff23a4dc6866f563

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