Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c88cb5d56a51e2f…

MALICIOUS

PDF

47.8 KB Created: 2021-06-09 12:19:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7dda9c6aca2aa50b8cf6b24a42ee7ccd SHA-1: 21040fb885eb71cf9c52577c7a0d53c5981fe806 SHA-256: 4c88cb5d56a51e2fb42490cd73cb1797932ed2680f29471108e160aaab99b097
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which appear to be SEO-optimized pages designed to lure users into downloading files related to popular games. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/roblox-lego-hacking-scrip-game-hack
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/free-promo-codes-for-robux_GM431946152.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/coin-master-free-spins-blogspot_GM406889139.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/coin-master-free-spins-coins_GM406889139.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/how-to-get-free-roebucks-without-verification_GM431946152.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/minecraft-java-edition-free-download-for-android_GM479516143.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/free-coins-coin-master-spins_GM406889139.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/free-robux-hacker-us_GM431946152.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/minecraft-free-download-android_GM479516143.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/como-hackear-juego-coin-master_GM406889139.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/free-robux-promo-codes_GM431946152.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/free-roblox-promo-codes-for-robux_GM431946152.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/coin-master-gold-cards-free-link_GM406889139.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/100-free-spins-coin-master-2021_GM406889139.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/roblox-free-robux_GM431946152.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/best-coin-master-hack_GM406889139.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/coin-master-hacks-xyz_GM406889139.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • https://elearning.mtsn2pml.sch.id/__statics/gudangsoal/files/coin-master-apk-hack-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005272.bin
beb03ae9533d8d15fa4e568012be1a61e6c1bc30362066b4dd7ddcb200e5e9f4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5272 24172 bytes
font_01_sfnt_off000089cd.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89CD 3884 bytes
font_02_sfnt_off00009675.bin
a1002c97e963093bd4727bf3f147e83b3a10f5a9a18f421a14f5ae67aa62a087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9675 18764 bytes

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