Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fba922a7897e322…

MALICIOUS

PDF

50.3 KB Created: 2021-06-03 05:52:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e829fa953da72a2c90e62448b5cd0a4f SHA-1: e37cdf6f3c90223b8b17011f58dab036455e536c SHA-256: 8fba922a7897e322d51f047c877d1781132b578f81e5447baa52f2d443896545
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious link disguised as a game hack generator, which is a common lure for phishing or malware distribution. The link points to infrastructure known for malicious redirectors. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/how-to-get-free-robux-promo-codes-game-hack In PDF document text
    • http://library.polita.ac.id/repository/free-games-coin-master_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/coin-master-60-spins_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.polita.ac.id/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/coin-master-strategy_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://library.polita.ac.id/repository/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-roblox-exploit-scripts-for-executor_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/roblox-com-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_004_off000050da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50DA 26232 bytes
SHA-256: 86540c90213431abd875b81aef7161d6b7f7f457b2245feefcee336cc92c4ed6
font_01_sfnt_off00008eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB2 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_02_sfnt_off0000a023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA023 18872 bytes
SHA-256: 5ac59f2bbd716fa5a12c7062aef47b6358464a1e75e3d61e5fb3ce0da7ae841b

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