Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b57566976ed8ed…

MALICIOUS

PDF

33.9 KB Created: 2021-07-07 16:42:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 475bd4f2e83baf09fbaa071fd667364e SHA-1: 171076f8b6ba04a8a0b9698400182a434dbfad3f SHA-256: e4b57566976ed8ed70ddb0318c843ce84ba4b3f58709b7a21730e5a94a39fc8b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/free-robux-pins-game-hack. The document body and embedded links suggest a lure for free game currency or hacks, a common social engineering tactic. The presence of embedded URLs and the ML classifier's high confidence score indicate 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/431946152/free-robux-pins-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-spin-pattern_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/code-for-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-rewards_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-on-mobile-ipad_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-noclip-in-roblox-with-cheat-engline_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-free-play-no-download-games_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-link-2021-today_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_off00002d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D05 22800 bytes
SHA-256: 59654c8847d2b501dbc3ded5de52178774c8e2d0eb30b4aad5cd25cfd81c8672
font_01_sfnt_off00005fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDC 18992 bytes
SHA-256: e2f6e7493aec948a310ee99e045c3bc4058c5863f97c0ca4c5f0464a4f6a53a8