Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca567e1a206686bc…

MALICIOUS

PDF

44.5 KB Created: 2021-05-19 15:47:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a5d51b041a0d11dd93ffc73980a452bc SHA-1: 918cb48558b3cfedf4cdba7ce977d2f0ee5e899b SHA-256: ca567e1a206686bc233ed09d042724508449da3da195f9d4ca218c6143e9cf2e
102 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a tactic to manipulate search engine results or direct users to potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The document body and embedded links point towards lures for game-related cheats or hacks, such as Coin Master or Robux.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 https://netcdn.xyz/app/406889139/coin-master-free-shield-game-hack
    • https://iear.com.tw/image/data/files/free-coin-master-spins-link_GM406889139.pdf
    • https://iear.com.tw/image/data/files/ways-to-get-free-robux-2021_GM431946152.pdf
    • https://iear.com.tw/image/data/files/roblox-help-free-robux_GM431946152.pdf
    • https://iear.com.tw/image/data/files/minecraft-free-download-mac-full-version_GM479516143.pdf
    • https://iear.com.tw/image/data/files/how-to-download-minecraft-for-free-on-android_GM479516143.pdf
    • https://iear.com.tw/image/data/files/orewards-com-free-robux_GM431946152.pdf
    • https://iear.com.tw/image/data/files/coin-master-hack-apk-link_GM406889139.pdf
    • https://iear.com.tw/image/data/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdf
    • https://iear.com.tw/image/data/files/coin-master-free-spin-ml_GM406889139.pdf
    • https://iear.com.tw/image/data/files/coin-master-ios-hack_GM406889139.pdf
    • https://iear.com.tw/image/data/files/free-robux-codes-no-verification_GM431946152.pdf
    • https://iear.com.tw/image/data/files/free-robux-hack_GM431946152.pdf
    • https://iear.com.tw/image/data/files/free-coin-master-spins-no-human-verification_GM406889139.pdf
    • https://iear.com.tw/image/data/files/coin-master-hack-https-coinms-net_GM406889139.pdf
    • https://iear.com.tw/image/data/files/free-apk-mod-coin-master_GM406889139.pdf
    • https://iear.com.tw/image/data/files/coin-master-game-hack-kaise-kare_GM406889139.pdf
    • https://iear.com.tw/image/data/files/all-minecraft-handbooks_GM479516143.pdf
    • https://iear.com.tw/image/data/files/free-robux-scam_GM431946152.pdf
    • https://iear.com.tw/image/data/files/get-free-robux-info_GM431946152.pdf
    • https://iear.com.tw/image/data/files/free-spins-coin-master-twitter_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004978.bin
38a78fa16cdcee4a73902d4098d83defd722b4888c4adec792ff8f12c18eee28
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4978 24968 bytes
font_01_sfnt_off00008201.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
pdf-font-stream PDF embedded font (sfnt) at offset 0x8201 2880 bytes
font_02_sfnt_off00008bec.bin
0603797a96d274ba874b32f91d1fb50d5f45d88cdb7e6803905a22f8023fb5df
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEC 18124 bytes