Malicious PDF — malware analysis report

Static analysis result for SHA-256 6172e65f2c1fa8b1…

MALICIOUS

PDF

50.1 KB Created: 2021-05-12 19:02:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 627e136d0d65d6ec666534d2acfe0c8c SHA-1: 1f51b35447135bb23e903c50f3a035af26022407 SHA-256: 6172e65f2c1fa8b1b61031eb1b1e9ead2bb425a07b71bab1e5ad25cc6502d672
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free Robux' or game hacks. The ML classifier also flagged this PDF as malicious. The document body and embedded URLs suggest a social engineering lure to drive users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

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 https://netcdn.xyz/app/431946152/blox-fish-free-robux-game-hack In PDF document text
    • http://chartsmart.com.au/images/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://chartsmart.com.au/images/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://chartsmart.com.au/images/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/roblox-cheat_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://chartsmart.com.au/images/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://chartsmart.com.au/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://chartsmart.com.au/images/free-robux-hack-2021_GM431946152.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_off00004aa7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA7 24960 bytes
SHA-256: fdada70fafe027102a596eb62b85b5d133129a252180946cc3b25de69fd4df43
font_01_sfnt_off000084c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C2 8836 bytes
SHA-256: 9402b74f0c00d3fba1aa41bfce63aaafd422da0ae018383018ea6abc00d217f2
font_02_sfnt_off0000a19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA19E 18376 bytes
SHA-256: 833bfe47d36e77ffff594e1188eeee77c72f4d78f65cd820fb361f10e8c51563

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