Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f3f5aa16aeb1da…

MALICIOUS

PDF

41.3 KB Created: 2021-05-14 08:01:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cb52c475317769c36f92243e65fdf12d SHA-1: 67edf74626fc242f023715ac28653be2994fe374 SHA-256: 54f3f5aa16aeb1da8ab6282922ef1ca64bccfacb93e467f70701f6f6867d1e13
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising free game hacks and currency. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly indicate a phishing or scam attempt. The document body, though partially corrupted, contains references to 'free generator / game hack' and a URL that aligns with this lure. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/free-spin-coin-master-link-2021-game-hack In PDF document text
    • https://arcasict.nl/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://arcasict.nl/images/game-give-free-robux_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/free-robux-reddit_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/free-robux-wheel_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://arcasict.nl/images/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/coin-master-game_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://arcasict.nl/images/how-to-get-free-premium-roblox_GM431946152.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_003_off000045e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45E1 24608 bytes
SHA-256: d175b310226492e2e2533b3d598ec73d76617fcb594436ac4cf5ffe95b352fd7
font_01_sfnt_off00007e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E72 18456 bytes
SHA-256: e9900cc34792e9e10189734f2c0a95be85fa7d2c8d6cb23872c5da80ce816735

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