Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c0f22bf8eef533…

MALICIOUS

PDF

53.9 KB Created: 2021-06-03 15:20:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c8f41b0bb314a6aadd2faffd2512b1c4 SHA-1: add4b2671be133bbb9ef243ed152d92810a89f76 SHA-256: 74c0f22bf8eef533ac105a69bdf7941d03417514304d84684cfb9d2191b3366c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically luring users with 'free generator / game hack' content. The embedded URL points to a known malicious redirector infrastructure. The document body, though partially garbled, contains references to 'free Robux' and a URL that aligns with the heuristic findings, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

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.online/app/431946152/how-to-get-free-robux-by-playing-games-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-free-login_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/pokemon-go-free-app-download_GM1094591345.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/hack-a-game_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-free-body_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/getrobux-come_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/mine-minecraft-games-for-free_GM479516143.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_004_off000052c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C0 34988 bytes
SHA-256: 8509353ef3ea3a3082e8af9638bc77d111146e502bf946090609419b85dd91ea
font_01_sfnt_off00009ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF3 3608 bytes
SHA-256: 608f0dd4f6bfb6adbccec84228618ee8e4c9e09226d7330efb5300e499d1567f
font_02_sfnt_off0000ac7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7A 19588 bytes
SHA-256: 4959be52701d88ef79c98b835575558ad206ad5c377459138293e90af74f97c3

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