Malicious PDF — malware analysis report

Static analysis result for SHA-256 97687fc38601daf5…

MALICIOUS

PDF

34.8 KB Created: 2021-06-29 05:17:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dfc91f9ff5c3d651ee85f80e679c4a55 SHA-1: 181935504c3fd5d8c0e7bdf88f082b07246b9a32 SHA-256: 97687fc38601daf54571829a1dd792b3637e2423a03c6cd194f9be62be10d9d0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The primary malicious URL identified is http://netcdn.co/app/431946152/free-robux-for-kids-that-can-hack-it-game-hack. While no scripts were extracted, the document's structure and embedded URLs strongly indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

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.co/app/431946152/free-robux-for-kids-that-can-hack-it-game-hack In PDF document text
    • http://perpus.ar-rum.ac.id/repository/how-to-get-free-bc-on-roblox-ipad_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/shirt-roblox-2021-free-dowload_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-followers-on-tiktok-no-verification_GM835599320.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/how-to-hack-a-roblox-gamw_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/hacking-simulator-game-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-stuff-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-free-robux-generator-online-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/how-to-hack-roblox-to-get-admin_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/project-alpha-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-roblox-stuff-2021_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
font_00_sfnt_off000031c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C7 22012 bytes
SHA-256: 83cf78ddb904192b9cbb3231aa4a7aad916e775b0f216b449fffc5a58ef0a0d1
font_01_sfnt_off00006209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6209 19448 bytes
SHA-256: e877cdaec09988b4ee1e97c3aa533a4ee7939d9ec856ccab4c91396e860672dd