Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7049c1cf89e5b5d…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 12:21:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cdcfcc7df2e0af3e1224d2a4c01c25fe SHA-1: 66e38b3263d6daac4001d5f69a55d4ec1edf45b7 SHA-256: d7049c1cf89e5b5dab2f3bce183155bd750857ffb923cfde8352568db5138b8c
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are presented as downloadable files related to game hacks and cheats. The ML classifier and the PDF_SEO_LINK_FARM heuristic strongly indicate malicious intent, likely to direct users to download unwanted or malicious software. The presence of a 'download button' lure further supports this phishing-like tactic.

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/406889139/coin-master-hack-2021-ios-download-game-hack PDF link annotation
    • https://anshingtek.com.tw/image/data/files/free-coin-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/get-your-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-roblox-card_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/roblox-free-t-shirt-upload_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/roblox-generator-2021-hack_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-intsall-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/roblox-hack-robux-download-free_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-robux-hack-pastebin-2021_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spins-link-2021-no-verification_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/pokemon-go-free-codes-october-2021_GM1094591345.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/como-descargar-hacks-para-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/roblox-ban_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-70-spin-link-2021_GM406889139.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
stream_002_off0000308f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x308F 22800 bytes
SHA-256: e64853a1a30018e51b5ba24c26f9ac0186f44a1202804b52c7e1a5ed5190d49f
font_01_sfnt_off0000637b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637B 18988 bytes
SHA-256: 050b91db1b0ce997d5149ba527f7e1e895cfc1813b762364afa072aec8cf4c9e

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