Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28a597f77452422…

MALICIOUS

PDF

49.5 KB Created: 2021-06-03 04:54:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 781ebed06990b19b0dc21fec16e1ed4d SHA-1: a06a470bae418d46a1d2731ae3a7e74c15bf22f7 SHA-256: d28a597f774524227f981dc1a69fee79505e92dbbf5c6aa84e2defe41b665723
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and generators, indicating a lure for potentially malicious content or scams. The presence of a known malicious redirector URL and a large number of external links suggests a coordinated effort to drive traffic to these sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • 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.
  • 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.online/app/431946152/robux-app-game-hack In PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/daily-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-free-robux-on-android_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_004_off00005351.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5351 28400 bytes
SHA-256: f1a3ef4eba54691320d8184fed970022a84fc3c25961727d9778b80aa709cb56
font_01_sfnt_off000095b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95B1 2824 bytes
SHA-256: 1d0cb1023eaa225682b8e7a2c8df4e4c96545ba7eedaf3d9844e51183e9ca189
font_02_sfnt_off00009f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F5D 18024 bytes
SHA-256: 219c55bb431f43351bcf1592a83073a1c751ddd41efaa2bf419dfd5689889aab

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