Malicious PDF — malware analysis report

Static analysis result for SHA-256 878fb4bff90f8f22…

MALICIOUS

PDF

45.8 KB Created: 2021-05-13 02:03:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fec899bd92eeadc77dd90620d70b5a16 SHA-1: 6b02bbcae6917a921cf552825bf8311fb11a82f3 SHA-256: 878fb4bff90f8f22c98e10685958ed722ec1ee5adf34603ab277e0cccd759a6e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, identified as a 'link farm' by heuristics, pointing to websites that offer game hacks and generators. The primary lure appears to be related to Coin Master and Roblox, suggesting a scam or phishing attempt to trick users into visiting potentially malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/easiest-coin-master-hack-game-hack PDF link annotation
    • https://www.simplenepaltravel.com/userfiles/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-robux-games_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/robux-online_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/roblox-robux-generator-no-human-verification_GM431946152.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_off00004c2d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C2D 25148 bytes
SHA-256: 1c1792652381bd46f58161e47f43149e4213f1f2a28df43f4d95059863f4268c
font_01_sfnt_off000085c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C8 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off0000924e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x924E 17716 bytes
SHA-256: 2777df0864118f7a8b0836e6f140f12d2c0b51bcfdff72c423501d2323673959

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