Malicious PDF — malware analysis report

Static analysis result for SHA-256 a561566fdc5359f3…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 19:09:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7ac1f1d9fcfb422cd648eb493e441ae8 SHA-1: 51ee63d3f16cba3a4c46323abf70f993b260acef SHA-256: a561566fdc5359f38aeddb8b92a28be1e7831885b7e7fef74041d987ab2d505c
122 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which are related to obtaining free in-game currency or cheats for popular mobile games like Coin Master and Roblox. This pattern is consistent with phishing or scam lures designed to drive traffic to potentially malicious websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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 http://netcdn.tw/app/406889139/how-to-get-free-spins-in-coin-master-game-hack
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-stars_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/free-coin-master-spins-for-today_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/free-roblox-adopt-me-pets_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/free-diamonds-coin-master_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/money-hack-ultimate-driving-roblox-2021-april_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/coin-master-hacks-for-android_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/roblox-mobile-hack_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-password-or-survey_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/roblox-comment-avoir-le-shirt-swat-free_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/free-wings-roblox-catalog_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-that-really_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/free-coins-coin-master-blog_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/free-coins-and-spins-link-for-coin-master_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://libnh.stikesnh.ac.id/repository/dragon-ball-ultimate-hack-roblox_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-someones-roblox-account-on-phone_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/roblox-cheats-how-to-get-free-clothes_GM431946152.pdf
    • http://libnh.stikesnh.ac.id/repository/free-robux-hack-on-pc-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003277.bin
2abb0ef9c6d8192dd981d6072848adb079217fee9c4b0bac49d9bd240a92d87d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3277 23608 bytes
font_01_sfnt_off000067d7.bin
11de4304e4fdf887d410d1e4a25cee46ae29c04a9263dbbe12b650d8207992b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D7 18336 bytes

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