Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7f552b19034fbe…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 06:03:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a9e6ae398d4e906a1b2a9654793f6e41 SHA-1: 046dacd776c7cad3e5a27d0da5771c4eb0d0aefb SHA-256: 5a7f552b19034fbe8b8030abe80d6fa8f053cf0fa54dccaa8a7937da8b94229a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to free game currency and hacks, embedding multiple links to redirector infrastructure. The primary malicious URL identified is https://netcdn.online/app/431946152/bux-life-free-robux-game-hack, which is part of a known malicious redirector chain. The document's structure and embedded links strongly suggest it is designed to lead users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/bux-life-free-robux-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/cm-daily-spins_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-person_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/pubg-uc-apk_GM1330123889.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/rbx-sites_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-link-download-ios_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_off00004eb7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EB7 25892 bytes
SHA-256: a8c66fd7b867c3014d2c5688e3b88442b54c5f83ae4036f6f69e7548d4845d7a
font_01_sfnt_off000089bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89BC 18136 bytes
SHA-256: 29dc967668ee0d992c179c4e94ca6f9cb219d50b5ccf800f63d20fdab69e699e

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