Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f56aa3ecb24e470…

MALICIOUS

PDF

47.0 KB Created: 2021-06-09 16:16:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 08daad0cd14bfd7b778f926c2c97fd0f SHA-1: 87343c9742ab0fb8b0f74fc7120b72fc59799eab SHA-256: 8f56aa3ecb24e470fe4651f02cc2116c6ea3b3743ad2809ca8a0cf6ea9174f6e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, disguised as game hacks or free currency generators. The primary lure is a link to 'como-hackear-una-cuenta-de-roblox-facil-y-rapido-game-hack', which is hosted on a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/como-hackear-una-cuenta-de-roblox-facil-y-rapido-game-hack In PDF document text
    • http://lib.akper17.ac.id/repository/xray-hack_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.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_004_off000051ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51ED 27492 bytes
SHA-256: af5e8d869a021aa2f4ea2858085b6674e75baa2767cfd0a6d13d9279a9ddf49a
font_01_sfnt_off000090bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90BD 19836 bytes
SHA-256: 0211dd3421f1d36976ed1807dbf263639f60304321c86f5ae74e4180b76fc96a

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