Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa353da78f18ab2a…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 22:06:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 431ad11e13854e7000b7cb7b10d1137a SHA-1: 971a36a81e10db3925bd3d2792fbdaf8345e8580 SHA-256: aa353da78f18ab2a56d6e84db232d7f111eef88d71c4b3108f67b638297c20db
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector. The document body explicitly mentions 'game hack' and 'free generator', and the primary URL points to such content. This suggests a lure to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

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/406889139/how-to-get-more-spins-on-coin-master-for-free-game-hack In PDF document text
    • http://library.persadabunda.ac.id/repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/www-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/is-it-true-you-can-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-apps-that-work_GM431946152.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_002_off00003103.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3103 23004 bytes
SHA-256: 07e0cb94f80ccad5c3f9c5dee0381831edd490176226b4d18ba3f64a2249989e
font_01_sfnt_off000064e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E5 18336 bytes
SHA-256: 12621307122dc6a065189aa67f7d6a9fc29493de1d62e5dd533d31b12572ea83

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