Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcc55ab7bcd6fec…

MALICIOUS

PDF

34.8 KB Created: 2021-06-18 05:30:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 00b75ec641591a3ef87d202078849c16 SHA-1: 09d140a410907916a6a66888130e5634bf08b59b SHA-256: 4dcc55ab7bcd6fec29b994ef942d3b8a3ed604c9bd4160f25839be83474ec6d7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a URL that is known to host malicious redirectors. The document body explicitly mentions 'how-to-get-free-robux-in-roblox' and includes the malicious URL, indicating a social engineering attempt to trick users into downloading further malware. While no scripts were extracted, the presence of malicious links and the lure strongly suggest a downloader or redirector pattern.

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/how-to-get-free-robux-in-roblox-on-computer-game-hack In PDF document text
    • http://perpus.ar-rum.ac.id//repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-robux-hack-no-survey-online_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/how-to-hack-on-roblox-skyleree_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-cheat-engine-hacks-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/comandos-hack-para-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-cheat-engine-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/roblox-hack-2021-download_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-homepage_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-draw-game-roblox_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_off000031bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31BD 21836 bytes
SHA-256: 49b4b8fa05b0d85ca30e60cd2999ef940b79aed3216d1169158f4a3938e165a0
font_01_sfnt_off000061c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C7 19492 bytes
SHA-256: 3245c4cece003112bfcc59bbcc113f0015f4f3d5cdf6be76f779cb370f4e1fd5

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