Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a167aa13f383596…

MALICIOUS

PDF

45.1 KB Created: 2021-06-04 02:18:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6dd057505d7dc97edeb5064cee2f4226 SHA-1: dc988f859c1c23f3cc5eed6c3abd032d6453c73d SHA-256: 4a167aa13f383596be98caea7aae4dc97e9123f80a2643b3b32d27a3ea158590
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, specifically disguised as a 'free generator / game hack'. The embedded URL, https://netcdn.online/app/431946152/free-robux-obby-2021-game-hack, is also flagged as malicious. The document body and metadata indicate it is a lure for game-related cheats, likely intended to trick users into downloading or executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/free-robux-obby-2021-game-hack In PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/coin-master-hack-spins-download_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/pokemon-go-free-vs-ultra_GM1094591345.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/how-to-get-free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/free-star-codes-roblox_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_off000053a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A8 25452 bytes
SHA-256: 2982a6411cf0739505f45897bfb1548f6f7e7d2e5465c09bb3f5cbc7cca97b1e
font_01_sfnt_off00008c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C74 18596 bytes
SHA-256: 4ee57ed15e8700d5e4346dbed35fcc2f6ba8dbed04d546ac38088c27601a53c6

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