Malicious PDF — malware analysis report

Static analysis result for SHA-256 4169abcd984b1c53…

MALICIOUS

PDF

48.7 KB Created: 2021-05-11 01:36:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7b538116e3b25412a51d87e22c32ea0c SHA-1: a8ace980d51544d9aae7ebb706fa71f663dc7831 SHA-256: 4169abcd984b1c53fcf9b4b3abab3931668a8b4b4302fb3b022342daf200b415
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to a known malicious domain, masquerading as a 'free generator' or 'game hack'. The document body and heuristics indicate a lure for free game currency or hacks, likely intended to lead users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the presence of malicious redirector links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

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 https://netcdn.xyz/app/431946152/free-robux-hack-us-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-spins-hack-2021_GM406889139.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_003_off000049ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49CE 24948 bytes
SHA-256: 07c3ab93f7dc101bbe278ce66943f182b33d874f8992916a9da71ea2d1cd22af
font_01_sfnt_off0000821f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x821F 2956 bytes
SHA-256: bab8933fc39dc331bc4c1c904a82b1432ab2e02478fa0a59453c98c5c231da8d
font_02_sfnt_off00008c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C39 6100 bytes
SHA-256: f866077ce59d6ea276f75e4af76daa2aab5f3a1a679df144776123d85664d65c
font_03_sfnt_off00009ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC4 18600 bytes
SHA-256: be32b0f906764c1f2317decc7ac5a24a5975e1ace61028a3a9703984df87bb8b

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