Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9791090606df8a…

MALICIOUS

PDF

45.4 KB Created: 2021-05-13 05:34:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: beebbffa9343d1d9a90348ab24f28733 SHA-1: 483f7551129fe7ab4b39812a0debd4d65d18c304 SHA-256: 4a9791090606df8af78badf8663100ceee84f3b257c6d5abf2c78b0ba6121b75
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as "free generators" or "game hacks" for popular mobile games. The document body and embedded URLs strongly suggest a phishing or scam attempt to lure users to malicious sites. No scripts were extracted, but the presence of malicious links and the lure indicate a high likelihood of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/hack-coin-master-8-ball-pool-game-hack In PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004890.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4890 25840 bytes
SHA-256: 8ccb9b65c7594684c27530aea60555f2d9b9b1a94dfeee4df0f1a5d7acce00da
font_01_sfnt_off000084c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C7 2924 bytes
SHA-256: 89b375b3099c16285f8fe3c63d3b9e52cb99b52dd2caab822764707661633145
font_02_sfnt_off00008eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDA 18372 bytes
SHA-256: b4813e09d90f612ee66c803ba32218c751333fc6bf2f429b5e69f4ac915b2ccc

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