Malicious PDF — malware analysis report

Static analysis result for SHA-256 3447b15be6fa3852…

MALICIOUS

PDF

44.6 KB Created: 2021-06-09 00:02:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fd124d7e229d941654fd2789e0b6764e SHA-1: f510b61b8dca5a81e3672c113cf17feb65b40f24 SHA-256: 3447b15be6fa3852b1725c2d047e24c1e73ec251e378b58eebfd856e8053e85c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/case-opener-hack-roblox-game-hack PDF link annotation
    • http://perpus.i2s-learning.com/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/robux-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-village-4_GM406889139.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_004_off00005328.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5328 24644 bytes
SHA-256: 0c9baa29521d9cebe07294ebdb6d3522ef454f405a86830b521ecb83de7367e2
font_01_sfnt_off00008b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5D 18356 bytes
SHA-256: ee68cceb15d46931ce8c9d627418abbc30b65121874b9a5404c855dc8277a837

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