Malicious PDF — malware analysis report

Static analysis result for SHA-256 db40bb5572aeb8a0…

MALICIOUS

PDF

35.2 KB Created: 2021-07-07 03:34:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 578630b4075ad5a75a038423febddc36 SHA-1: 09aa1305b6916fd5956b328db3ee0c3f0218d8e4 SHA-256: db40bb5572aeb8a03fda147cf1cbd57405521fbe5ae3832efde5ba4a0514b1c1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs and a link farm, advertising free game hacks and in-game currency to entice users to click. The primary URL, http://netcdn.tw/app/479516143/minecraft-free-download-unblocked-game-hack, likely serves as a landing page for malicious downloads. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/479516143/minecraft-free-download-unblocked-game-hack
    • https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-fast_GM431946152.pdf
    • https://www.tiancom.com.tw/upload/files/how-to-download-minecraft-hacks_GM479516143.pdf
    • https://www.tiancom.com.tw/upload/files/coin-spin_GM406889139.pdf
    • https://www.tiancom.com.tw/upload/files/games-that-give-u-free-robux_GM431946152.pdf
    • https://www.tiancom.com.tw/upload/files/how-many-levels-are-in-coin-master_GM406889139.pdf
    • https://www.tiancom.com.tw/upload/files/how-do-you-hack-into-a-roblox-account_GM431946152.pdf
    • https://www.tiancom.com.tw/upload/files/free-spins-coin-master-hack-2021_GM406889139.pdf
    • https://www.tiancom.com.tw/upload/files/hack-para-coin-master-sin-verification_GM406889139.pdf
    • https://www.tiancom.com.tw/upload/files/how-to-hack-on-roblox-teacup-hack_GM431946152.pdf
    • https://www.tiancom.com.tw/upload/files/fun-flex-roblox-hacks_GM431946152.pdf
    • https://www.tiancom.com.tw/upload/files/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdf
    • https://www.tiancom.com.tw/upload/files/lazyblocks-com-free-robux_GM431946152.pdf
    • https://www.tiancom.com.tw/upload/files/free-bc-robux_GM431946152.pdf
    • https://www.tiancom.com.tw/upload/files/hot-to-get-money-in-roblox-for-free_GM431946152.pdf
    • https://www.tiancom.com.tw/upload/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • https://www.tiancom.com.tw/upload/files/minecraft-hacks-ps4_GM479516143.pdf
    • https://www.tiancom.com.tw/upload/files/hack-xp-net-coin-master_GM406889139.pdf
    • https://www.tiancom.com.tw/upload/files/megan-hack-roblox-executor_GM431946152.pdf
    • https://www.tiancom.com.tw/upload/files/free-minecraft-account-list_GM479516143.pdf
    • https://www.tiancom.com.tw/upload/files/hack-coin-master-apk-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032ef.bin
7cf88b90718cfa5534f1c5fe8c33ac37b966e6443ec1e800dba1b98f36f5ca99
pdf-font-stream PDF embedded font (sfnt) at offset 0x32EF 22408 bytes
font_01_sfnt_off00006493.bin
b89de8ec978c760e16c728bf26098254cc88868f8675788ef266acc2a2d3d026
pdf-font-stream PDF embedded font (sfnt) at offset 0x6493 19092 bytes