Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fc262fb598d8f4…

MALICIOUS

PDF

47.3 KB Created: 2021-05-19 06:41:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 901f53fc57e72dbdc46eca7df0a59e2d SHA-1: 5bd5982598b134b44eca8079e812a82f0df1a0bb SHA-256: e4fc262fb598d8f4c48c45afcb864c2492070e0a86984ff8f7bec47d90f30e33
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized lures for game hacks and free currency. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of many 'PDF_SEO_LINK_FARM' findings strongly indicate a malicious intent to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/406889139/free-coins-coin-master-link-2021-game-hack PDF link annotation
    • http://ipdrs.org/images/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://ipdrs.org/images/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/coin-master-gift-link-hack_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_003_off00004c6e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C6E 28248 bytes
SHA-256: 61f74e0da39b9d120ca39d34cd416ddfe348edd358dfd1e14c1ee64b635be403
font_01_sfnt_off00008ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA7 2872 bytes
SHA-256: ddcc3a5e7a6aa1de358cfa90ca854c2543f9d5fa5646cb34984d2fb90089b4d9
font_02_sfnt_off0000968d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x968D 18284 bytes
SHA-256: 0befb7fb80ec939a94ee4878df3159d75093faaca76bf929c3a9ca9c0862c597

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