Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef3a3fd54d1ffc6…

MALICIOUS

PDF

35.3 KB Created: 2021-07-04 13:23:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 03d57622dd11c787fa14b33d8cbb9e7a SHA-1: 7983ecd087564c4d57245a94adb70edfe5c3d69d SHA-256: eef3a3fd54d1ffc638592cbaa1628253171cff6d852d4e04654aee4c4a64ae0d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a known malicious redirector, designed to lure users into downloading potentially unwanted or malicious software. The document body and embedded URLs suggest a theme of game hacks and generators, a common lure for phishing and malware distribution. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate a malicious intent.

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/479516143/minecraft-pe-apk-download-free-015-0-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-jjsploit-money-hack-any-game_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/login-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/phlego-films-roblox-free-bsdge_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-roblox-accounts-with-robux-and-bc_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/cheat-roblox-dungeon-quest_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-code-generator-tool_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-free-robux-no-real-money-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/lacify-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hack-for-pet-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-game-nocopyslocked_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/daily-free-spin-coin-master-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_off000031e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E6 22520 bytes
SHA-256: d3b76a763354cfb5343c1d91d780b686f951490d0c76c64cd58c5f128e09197d
font_01_sfnt_off00006394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6394 19488 bytes
SHA-256: 6ab0bb34bdf9936d74a5069a2fe515894561d4fac5c5667c4e53c9feabf663f7

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