Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea10fc48e9187ee…

MALICIOUS

PDF

46.4 KB Created: 2021-06-03 12:07:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f35ccb7724c2a6a540020f8fda1dcea9 SHA-1: 45bd2360795bc2b0258c506f5fa0932ff09525d9 SHA-256: 4ea10fc48e9187eee9ddc53646102fbafde392626555cc5b7bd823a1e6cdf927
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure related to "game hack" and "free generator" for Coin Master, directing users to a URL that appears to be part of a link farm. The document body, though heavily obfuscated, contains references to the lure. The presence of numerous external PDF links, including one pointing to a "coin master free spins" PDF, strongly suggests a social engineering tactic to drive traffic to malicious or spam-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.online/app/406889139/como-hackear-coin-master-en-espaol-game-hack PDF link annotation
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/robux-offers_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-robux-website_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_004_off00004ee4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EE4 25336 bytes
SHA-256: 0209334201593c6edc0a01dd50594a27977d7ec62947e60d2a50c55bd839e8d3
font_01_sfnt_off000088f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F4 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000092a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92A6 18224 bytes
SHA-256: 123f8386315a91293958179ffe58ecd8d69104faea04a921c44476c066c42c52

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