Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a99dc9a9bc3995d…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 08:04:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4e3e0b7a4302f03c0e2a98810bd62afc SHA-1: 42a5e8989af5d3aa2a77066ff6d28ee1be800a4a SHA-256: 8a99dc9a9bc3995dd08da2e76744aa8ed93f4ef308bcdb532c0dd33f65963290
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is designed as a lure, employing tactics to trick users into visiting malicious websites by promising game hacks and free in-game currency. The document contains numerous links to external PDF files hosted on domains associated with link farms and potentially malicious redirectors, indicating a campaign to drive traffic to exploit or phishing sites. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/coin-master-free-daily-spins-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/robux-free-co_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-coins-and-spins-link_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_004_off00005037.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5037 24224 bytes
SHA-256: 62d04fb401f7a430e5baf4a9fbac15eeeff8fe96a2688c73a973e1e2ed5bc951
font_01_sfnt_off0000878a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x878A 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9175 18308 bytes
SHA-256: 5c3cefeee4a209382fad51155f4ab19c665f35dca270fe96ae1b58d23c3d8f95

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