Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5f0158ad2b94ea…

MALICIOUS

PDF

34.8 KB Created: 2021-06-30 22:08:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2bc0fc19f39dc530b8056159d2ec76eb SHA-1: 66855e75ec280d9f7df36c98f1b64e231aff364f SHA-256: 6a5f0158ad2b94ea1c4966545a56416e7f074f6da5633fc127211429384af84f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free accounts to entice users to click on embedded links. The primary link, http://netcdn.co/app/431946152/free-account-roblox-no-pin-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or social engineering attack aimed at driving traffic to malicious sites. The ML classifier also flagged this document as malicious.

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.co/app/431946152/free-account-roblox-no-pin-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/hex-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-builderman-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/sop-free-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-items_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/can-u-get-hacked-buying-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-online-without-download_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/cheat-engine-roblox-jailbreak-noclip_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-use-hacks-on-any-game-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/daily-free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-nintendo-switch-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hack-rpg-world-autofarm-buy-egg-tp-island-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-placerebuilder-cheat-engine-ban_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/master-coin-hack-game_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_off00003024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3024 22708 bytes
SHA-256: 4a8c9087d91596651e69f01d0e9b9a7361f7f95c63767f1c554ea16bf7856069
font_01_sfnt_off000062d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D7 19168 bytes
SHA-256: bf907443810df7c1fac0011cd3c0b157853838abaaf43a90d284a44d188929a6

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