Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e39fbd5d683bd0…

MALICIOUS

PDF

45.4 KB Created: 2021-05-11 03:31:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: af14fd1d2d09969e866c240edf13f046 SHA-1: ec962958667afc1be657874f4aabf36023962ddd SHA-256: 89e39fbd5d683bd0583d896111dd28f7c44b79df24c17279cd21a56082be2ba1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free Robux' and game hacks to deceive users. It contains multiple embedded URLs that likely lead to malicious sites for downloading further malware or conducting phishing. The ML classifier strongly indicated maliciousness, and the heuristics confirm the use of game hack lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 4

  • 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.xyz/app/431946152/free-robux-2021-game-hack PDF link annotation
    • http://www.flytec.com.py/download/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-robux-android_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.flytec.com.py/download/files/free-coin-master-spins-2021_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_003_off0000491d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491D 25932 bytes
SHA-256: 5e6c38c36e32500975ed1cc179a2c4a316143577c022c096761b82b7a5a582bb
font_01_sfnt_off000084ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84ED 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00008e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8D 18416 bytes
SHA-256: a2c808792aaeb1607b9c3a91ae122c662faffffe8d42f3cf4118be6ccc5b3e7b

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