Malicious PDF — malware analysis report

Static analysis result for SHA-256 afae73331aebcc15…

MALICIOUS

PDF

41.2 KB Created: 2021-05-11 14:08:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0dacf69620cafdf5dcd541c14b4bb302 SHA-1: 6f996b3303d91e56fce66c97be5bf4e4dd984381 SHA-256: afae73331aebcc1578f9d466b8b28641cc128d942b5e3111a3fa0cd3d3492ce6
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/479516143/hack-minecraft-game-hack PDF link annotation
    • http://pianoservice.com.ua/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-download-coin-master_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://pianoservice.com.ua/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://pianoservice.com.ua/images/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-free-robux_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/get-robux_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pianoservice.com.ua/images/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://pianoservice.com.ua/images/free-spin-coin-master-link-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_off0000492e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x492E 24236 bytes
SHA-256: 40acae11e7bd3cf33728a29660a625f56b83294e360b2769965db57637ebb96b
font_01_sfnt_off00008092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8092 17740 bytes
SHA-256: b48554faafe2bce709b64b5b5bb2139c5dbee2e20b18b96283c95ec436c1b8f7

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