Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a673c29b489eac0…

MALICIOUS

PDF

45.6 KB Created: 2021-06-10 18:15:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7111bffac27a0a579532c7eacb469905 SHA-1: 16f64d432a0d9c1a0b506ba272bb745c372be864 SHA-256: 6a673c29b489eac0f9f2085a64a7e5fbd95cdef8c99a0c232c0b0386c9c4cc9f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, disguised as a "free generator / game hack" lure. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the specific heuristic firings strongly indicate a social engineering attack aimed at redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-placerebuilder-cheat-engine-ban-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/pokemon-go-free-8-km-egg_GM1094591345.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-net_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-jailbreak-hack-script-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-24-7-minecraft-server_GM479516143.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
stream_004_off00005331.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5331 25216 bytes
SHA-256: ac04f14fa30a8c985190bd50b7c52225acedc25a106ff5d6c4a02c33a6c2b3fa
font_01_sfnt_off00008d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0B 19160 bytes
SHA-256: 6cd4cda9bf59d9b0477977f913689372878478f16e3df3d521038f4ffc0bd950

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