Malicious PDF — malware analysis report

Static analysis result for SHA-256 914fb1df59494a3c…

MALICIOUS

PDF

56.5 KB Created: 2021-06-11 03:50:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2640a17b5eb7ce9c16b6ffbd57c5e65d SHA-1: 6808c73630ccfc262380b9237f5d7959c3221099 SHA-256: 914fb1df59494a3c028bccdc6a9387bb597db710dded6d823b389a8f7584bd31
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as 'free generator' or 'game hack' lures. The primary link directs to netcdn.tw, which is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or social engineering attack aimed at driving traffic to potentially malicious sites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9649

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/free-roblox-cards-not-used-2021-game-hack In PDF document text
    • https://www.labdagatismk1pundong.com/repository/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/robux-game_GM431946152.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/how-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/free-cool-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/roblox-free-hats_GM431946152.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/coun-master_GM406889139.pdfIn PDF document text
    • https://labdagatismk1pundong.com/repository/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/instantrobux_GM431946152.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • https://www.labdagatismk1pundong.com/repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005415.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5415 26540 bytes
SHA-256: 58ce0a59cb8011ee7a1ee2dfed30717d99e95c931b930fea2964a312fc3d434e
font_01_sfnt_off0000909a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x909A 12800 bytes
SHA-256: db399d969d9309c9c38cb6e3c43aa83c06d227a5470715de93176d1df1e6747d
font_02_sfnt_off0000b877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB877 19044 bytes
SHA-256: 1b47d68471113451c9871707eb1b0d1a053c8adf4edeb5f7d0f56108472bb249

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