Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17278553d63b028…

MALICIOUS

PDF

44.3 KB Created: 2021-05-19 20:27:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2b8c3a476e0682c68846eb7e0e530319 SHA-1: 57a3da511bb9b93a48827a4898d153ac3c448be7 SHA-256: c17278553d63b028f93d8ea9b378130a8ca5d99329fda44c9d5ff09a86f1a13a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for "game hacks" and "freebies", designed to trick users into clicking through to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious redirection workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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.xyz/app/406889139/coin-master-hacks-2021-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/get-robux-today_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/earn-robux-sites_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-coins-generator_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_003_off00004826.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4826 24808 bytes
SHA-256: aee79a7f892abf2985120a2bc0d92a01816751347bfe057890bf13ced0dbbc02
font_01_sfnt_off000080d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80D5 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC0 18116 bytes
SHA-256: 17974cef81917e5ef69542194afa433aff210173cc902887fbc2b56a9328dd03

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