Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89255d067f500d8…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 17:44:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2a2963d19ac208d4e09cf4c6b58ab231 SHA-1: 1825376dab766e063cded033503ee1264a1558d4 SHA-256: a89255d067f500d8ac3dc7889ffd46e3f1e7cc6c476ca6f65026d70e5ca49849
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 0.9980

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 http://netcdn.tw/app/406889139/spin-coin-master-free-game-hack PDF link annotation
    • http://gts.edu.gh/library/repository/roblox-how-to-get-free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-roblox-logo-favor-bag_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-ip-tracker-hack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/wwwrobux-party-com-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-robux-with-code_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/i-can-hack-u-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-download-roblox-for-kids-on-laptop_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-1-coin-master_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_002_off00002fff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FFF 22860 bytes
SHA-256: d1bc977bbeac9de7396e635d988ddde63bc420fecfe52978471b18b1ecbd3202
font_01_sfnt_off00006348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6348 18176 bytes
SHA-256: 1096432c91a33187bc9c09511f00b7fa0c2395c0afe101c31e464ccb2ed8743e

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