Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8fb7a0b64ce363…

MALICIOUS

PDF

41.7 KB Created: 2021-05-12 16:35:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8825f8fa35a4233c4c62573aa2e546af SHA-1: 9e5122285a25e9ad50be67cfe60838094f7c7027 SHA-256: 7a8fb7a0b64ce3633853ec6c86f6088a9aec1f03eff3e6d4b5907ca26e71212e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-to-get-free-spins-on-coin-master-iphone-game-hack PDF link annotation
    • http://uptodate.az/images/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://uptodate.az/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://uptodate.az/images/how-to-robux_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/coin-master-hack-apk-july-2021_GM406889139.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_off000049a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49A2 24316 bytes
SHA-256: bb69f4a3dd5fd72e42b4870d65daba4d0239a88eacf0aba9571bfec79cbb3824
font_01_sfnt_off000080d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80D9 18216 bytes
SHA-256: 4abc04ae18af900904d959d44b4d7f5fba5ec4f6f1bcd15d05ed7773e8e469d6

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