Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7330efbc7e889a0…

MALICIOUS

PDF

41.1 KB Created: 2021-05-17 12:26:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 61bdfab56781a1a7b7235ddbcb383131 SHA-1: ff7561dbe3855ffbea692043c6183f0c76011e5d SHA-256: b7330efbc7e889a035eb1a8fc8bf5d155deb809f4af07e906fd6bd9d8b806152
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and free currency. The document body and embedded links point to the URL https://netcdn.xyz/app/431946152/get-free-robux-game-hack, which is identified as a malicious redirector. This suggests the primary goal is to lead the user to a potentially harmful site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/get-free-robux-game-hack In PDF document text
    • http://gomelavto.by/images/free-robux-now_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/ww-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/free-coin-master-glitches_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-spins-link-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • https://krnl.rocksIn 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_003_off00004444.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4444 26268 bytes
SHA-256: 79d4e18156c40120ccfcaba97406d7bde59341a5cda3b59dafbd74df62233bfb
font_01_sfnt_off00007eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EAF 18120 bytes
SHA-256: 79ac164380d838bf2943c127f808202d45f8751c05dbd036140e6fb9b1b49848

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