Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f675e6ee358fc05…

MALICIOUS

PDF

46.0 KB Created: 2021-06-03 18:29:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ec03e1e4ccd40af78dde4b95d6d8b663 SHA-1: 9cade2e904ebee1e01c021beadfb243b8481fb1c SHA-256: 1f675e6ee358fc05d9339b3100385d1a4ed0171913d40373835f864addcfcaa6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector URL that is associated with malicious activity, specifically luring users with promises of game hacks and free spins. The ML classifier also flagged this PDF as malicious. The embedded content, though heavily obfuscated, likely serves to facilitate the redirection to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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/406889139/coin-master-daily-free-spins-2021-game-hack In PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/cone-master_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coinmasterfreespins_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/haktuts-2021-coin-master-free-spin-link_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_004_off00004dbc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DBC 24400 bytes
SHA-256: 0a1c0bbab2ac8d14b525aee787a408f82754f9f0bd393f24b284cd80eb66c00d
font_01_sfnt_off0000859e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x859E 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4F 18708 bytes
SHA-256: 0e09573a858265cfc65c534eb28458a66078312e2bd7bae94317e03ea41fcd19

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