Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb5ad337665633a…

MALICIOUS

PDF

46.2 KB Created: 2021-05-12 08:36:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3cdeafb18925955fb9b9e5ef636d3a74 SHA-1: 39e1e3aa87cdfa72bfb2f43ec0710b3692ff523f SHA-256: 1cb5ad337665633a77ac2aad4c8ed36ed9a1bae1c0c8b3e5a8b44deb0de1184f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "free generators" and "game hacks". The document body and embedded URLs strongly suggest a social engineering lure designed to trick users into visiting potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector, likely intended to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9278

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/431946152/promo-code-free-robux-game-hack In PDF document text
    • http://libsmpn1balongpo.sch.id//repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/www-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-codes-2021_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_off00004b25.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B25 25384 bytes
SHA-256: 2ff7fa49dc0807e3dc5f893ef4ccc8d10c6cabd7ac9379c5af8ff6dd3016b7d7
font_01_sfnt_off0000865d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x865D 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9186 18604 bytes
SHA-256: fae8de94881284cdc44c9362006b897f1f4497b391b3b7f58f5f102f73a0fd89

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