Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b26b395f2de65c…

MALICIOUS

PDF

51.7 KB Created: 2021-06-09 06:01:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c24693d411114a984647ab965dcf2298 SHA-1: ca58fa002c7b638e13dfd34390df891ab3b32a30 SHA-256: 24b26b395f2de65c2cbc18614715b32a3cf71fa16415ee55ed155cb20bcf44af
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on them, likely for malicious purposes such as phishing or malware distribution. The heuristic firings indicate that the PDF links to known malicious redirectors and is part of a link farm, suggesting a coordinated effort to drive traffic to potentially harmful sites. The document body itself contains obfuscated text and URLs related to game hacks and free items, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/roblox-free-no-email-game-hack In PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-knife-capsules-speed-hack_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/inappropriate-roblox-games_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-win-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-hack-roblox-hack_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/green-hacked-roblox-t-shirt_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-hack-no-virus_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/code-free-robux_GM431946152.pdfIn PDF document text
    • https://pasca.unisba.ac.id/elibrary/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DA 25908 bytes
SHA-256: 058e836c924e3e0c58d1e6ba57a4563d5124da59f67f8ea810779376ce6bb155
font_01_sfnt_off00008ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA1 3112 bytes
SHA-256: 471f662098e83c5562504503f5e7603b336ca0957605358090bb98e15c7aed80
font_02_sfnt_off00009956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9956 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA668 18556 bytes
SHA-256: 52a20266c98ccc0d2add0a17984d317db9c090be4f5cf606f679266ec1fc9bee

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