Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd51e2ceebbb86c2…

MALICIOUS

PDF

43.5 KB Created: 2021-05-11 01:37:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 987bdcc12fd8b20b4cdbea3e3b37df27 SHA-1: 2d21cd307acc51660d8dbdd0f873ff312ce2c6d3 SHA-256: cd51e2ceebbb86c21f8d967216064bb14dc22a79f78885f55cf10d9dbb9dc080
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 0.9969

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/406889139/2021-free-coin-master-spins-game-hack PDF link annotation
    • http://perpus.ar-rum.ac.id//repository/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spin-group_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/robux-gainer_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/getrobux-now_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/daily-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/minecraft-116-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/roblox-scam_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/game-hunters-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spin-link-today-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_off00004c5e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C5E 25892 bytes
SHA-256: 6de36b87e072d4f8505dc66b835fbda18e961c3bec6527f44481abd9688def36
font_01_sfnt_off000087d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D8 18288 bytes
SHA-256: 09d15d14e106b24b2cc1eb8b87d838b97387230385a3ba043ca38e77a01d007f

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