Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79a2dd2c609a5ba…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 08:53:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b9769b77a2befa55b5aa516dfefaf206 SHA-1: 0e6fe1558a27daddcd6c3a702effdc8632c88a43 SHA-256: d79a2dd2c609a5ba6c401e8afe29deeeaf28b420d5d4c174257ef144b3413d83
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to entice users to click on embedded links. The primary link directs to a known malicious redirector infrastructure, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-codes-2021-real-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/husky-1-million-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-do-i-get-robux-for-free-in-a-iphone_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-fast-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-penguin-package-free_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-got-hacked-2021-video-and-evidence_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/knife-ability-test-roblox-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-necklace-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/ww-roblox-come_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/rbx-free-robux_GM431946152.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
font_00_sfnt_off00002d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D12 22628 bytes
SHA-256: 9d9129f57b156a4ddef694407631b3351e30820cdd3a84ad2a3287edaef2f1a1
font_01_sfnt_off00005f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F58 19364 bytes
SHA-256: 58b5540d62ffcbcd0cd09a8102d97fc092b94db7ea089f1030660d7870c6f7c3

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