Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16efa4b8bb315a8…

MALICIOUS

PDF

33.3 KB Created: 2021-06-29 06:52:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 09662ca76384b37cd94ba6231eb32d19 SHA-1: 98d3ba953a4b2df383a237a1effdad7a6c518491 SHA-256: f16efa4b8bb315a8eef8fff64ca74c8a36d454e8d59124fb46b7fcf5ce627f73
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one that redirects to known malicious infrastructure, masquerading as a "game hack" or "Robux generator". The document body explicitly mentions "CLICK HERE TO ACCESS ROBUX GENERATOR", indicating a social engineering lure. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.co/app/431946152/como-ser-hacker-en-roblox-2021-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-roblox-account-2021-easy_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-2021-xyz_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hack-cars_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/is-roblox-free-on-xbox-1_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-do-you-get-free-knives-in-roblox-assassin_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-a-halo-in-roblox-royale-high-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-hack-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hacker-clothing-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-people-can-get-hacked-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/get-free-robux-no-codes_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/earnrobux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cute-clothes-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-spin-link_GM406889139.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_off00002a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A8E 22492 bytes
SHA-256: 9379774e88fabfb89a3fb4d39d9bd9b900b0ee28b17055039b8215d76a97e32b
font_01_sfnt_off00005caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAA 19320 bytes
SHA-256: 1343575e2f8114d30b6cd4e76a227344f8e0d2628bc586afd3b0d5c50f379b52