Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83915a1efe736c4…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 12:08:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7c71e3b907ca3f01d816b44ede1c15ac SHA-1: 2e44f7105938cedcaa07a988ac137f838f7c59db SHA-256: f83915a1efe736c46eac19e9a7267cebf34c63c3de9a5280acf5af3f9a80aa4e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to a site offering 'free generator / game hack' content, identified as a malicious redirector. The document body explicitly mentions 'Getrobux Now' and includes the primary malicious URL, indicating a lure for users seeking in-game currency or cheats. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/getrobux-now-game-hack In PDF document text
    • http://perpus.unpam.ac.id/repository/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-hack-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-legendary-egg-in-roblox-mineing-simulator_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-robux-inspect-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/hack-robux-no-inspect_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/pubg-uc-alma_GM1330123889.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
font_00_sfnt_off00002f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F81 22644 bytes
SHA-256: 6a7c58bf7b7fa335374b1d6ceae56badf151a087fb25bfcff7c101b2d379f2c7
font_01_sfnt_off00006220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6220 18820 bytes
SHA-256: c947a45b753295a0739f9e073ebb3c99c504f2b62c282b6d89e2fd1f09780d18

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