Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3281c9f6edb671…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 07:10:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a27dd8803427d5b56fe4db36b8fbdd23 SHA-1: 1dd0a7aef469afa07133f7f8a87b528d664aa5a6 SHA-256: 1d3281c9f6edb671c56a6c5f7f34e90345e45c8e7c974e0874dd15fc5a232df0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks or free currency generators. The primary lure URL is http://netcdn.tw/app/431946152/robux-websites-2021-game-hack, which is flagged as a known malicious redirector. The document body and embedded URLs suggest a social engineering attempt to trick users into downloading potentially harmful files or visiting compromised sites.

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/robux-websites-2021-game-hack In PDF document text
    • http://chem.ipb.ac.id/kim/repository/master-coins-free_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-delitive-mod-cheat-codes_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/rewards-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/with-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-drawing-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/village-4-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/tiktok-free-search_GM835599320.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_off00002f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F96 22536 bytes
SHA-256: 4a33f5be0b6e3c4a47445c224e087d1783c5f8c4fe2a72dd3fa36bd6f3ba2778
font_01_sfnt_off000061ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61EF 19376 bytes
SHA-256: 8abac7f36f0f6ba9a6c410adf2bfd84174c2f93cc82f362ea9a5a51f34bdb61b

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