Malicious PDF — malware analysis report

Static analysis result for SHA-256 447e526f0a58db65…

MALICIOUS

PDF

48.7 KB Created: 2021-05-19 10:38:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c22707a9e827dffc38a4d1356f16c682 SHA-1: 8c8dfb596ac23bb31a700fe68b6ec89ce3bbf37d SHA-256: 447e526f0a58db65ff19cb20706b33e168576d58e6cc04e2b2f7e9692c20ff7c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document acts as a lure, promising free game hacks and generators to entice users to click on links. It contains a large number of external links, many pointing to other PDF files hosted on a link farm, suggesting a campaign to drive traffic or distribute further malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

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/431946152/free-roblox-gfx-game-hack PDF link annotation
    • http://apx-centre.ru/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://apx-centre.ru/images/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/fb-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/roblox-girl_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://apx-centre.ru/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://apx-centre.ru/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49A5 24564 bytes
SHA-256: 2ed59e3616a88e3af97f5511f9acbbfd627d760f95d6bf2be9cded202f0b33db
font_01_sfnt_off0000826d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x826D 4008 bytes
SHA-256: 515da38a799acdefd039af3a0dfb6ec4815b572058c9bd492ec5a77cd7658593
font_02_sfnt_off00008ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF4 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_03_sfnt_off00009c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C9B 17948 bytes
SHA-256: edf37cea4d9572b79aff99b5f3e3e51e81091579a2693570fa47b81a4934fab1

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