Malicious PDF — malware analysis report

Static analysis result for SHA-256 1981f69348d6db2a…

MALICIOUS

PDF

33.4 KB Created: 2021-07-02 03:02:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5b2b815f4909fb9b1f40c1cd355ec4ea SHA-1: f77f45b372398b63b1f0fc09d391e3c27a74691a SHA-256: 1981f69348d6db2a1afcd5d1509d17f993e4a3d60a3b49f2af76cc1ec2a61aa8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to known malicious redirectors, specifically advertising free in-game currency or hacks for popular games. The heuristic firings confirm the presence of a game hack redirect lure and malicious redirector infrastructure. While no scripts were explicitly extracted, the document's structure and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially malicious websites.

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/roblox-free-1-million-robux-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hack-roblox-apocalypse-rising-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hack-xyz_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-giver-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/is-pokemon-go-free-to-play_GM1094591345.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-mobile_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hack-roblox-android-lucky-patcher-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-2021-no-surver_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-free-drawing_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-character-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/realhack-for-roblox-real-coding-hack-for-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-admin-commands-on-roblox-no-injector_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spins-on-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_off00002ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DED 21408 bytes
SHA-256: 7666029c16a1c6186eda111470ae95acd647eec14a235710fcec08ceea259e2b
font_01_sfnt_off00005cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFE 19212 bytes
SHA-256: 5891fc5c5bac9753f5f25ad9179d48a24bb7364d00b01828f6518985dc24bd0f

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