Malicious PDF — malware analysis report

Static analysis result for SHA-256 992616c968494f4a…

MALICIOUS

PDF

44.8 KB Created: 2021-05-14 10:45:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b3c211ad8963832b23590f90eb71e36c SHA-1: 833eeb8a847946678580556714fe6f3dba9d1f9c SHA-256: 992616c968494f4aece0eeee3ff60479fb687297323544ec79afe4e77dcc4c18
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs and a document body that attempts to lure the user into downloading game-related hacks, specifically for "Coins Master". The presence of external URIs and the ML classifier's high confidence score indicate malicious intent. While no scripts were directly extracted, the document structure and embedded links suggest it's designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/coins-master-game-hack PDF link annotation
    • https://morishita-tc.com.tw/image/data/files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-pc_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/robux-without-verification_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-game_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-hackhub-coin-master_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_off00004b5d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B5D 25308 bytes
SHA-256: 79026fdbc555931772e35c533c09935eea2cc719113d29d5e08be3631f0b1677
font_01_sfnt_off000083fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83FD 17544 bytes
SHA-256: c9bcf992f56036f7990d1d97856b1a720a277248fb627b4b4849cf1459fc1402
font_02_sfnt_off0000a3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3DC 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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