Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de273acfaf52866…

MALICIOUS

PDF

45.6 KB Created: 2021-05-15 03:53:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5c972f3170102f8f7e43af57d804d485 SHA-1: e1aedaf31ecb92689092af5e40fb116e0de9bd52 SHA-256: 4de273acfaf52866a9d2c3c0a7cc49740581324529ca8d896ae06e0d17fcda1d
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a link farm, suggesting an attempt to redirect users to malicious sites for downloading files. The presence of a 'download button' heuristic further supports this malicious workflow. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/431946152/free-robux-exe-game-hack
    • http://apartstmichel.com.ar/images/free-coin-master-spins-no-human-verification_GM406889139.pdf
    • http://apartstmichel.com.ar/images/how-to-find-coin-master-free-spin-link_GM406889139.pdf
    • http://apartstmichel.com.ar/images/coin-master-free-coins-today_GM406889139.pdf
    • http://apartstmichel.com.ar/images/hackear-coin-master-sin-root_GM406889139.pdf
    • http://apartstmichel.com.ar/images/free-avatar-roblox_GM431946152.pdf
    • http://apartstmichel.com.ar/images/hacks-to-get-free-robux_GM431946152.pdf
    • http://apartstmichel.com.ar/images/minecraft-pocket-edition-free-apk_GM479516143.pdf
    • http://apartstmichel.com.ar/images/free-robux-no-human-verification_GM431946152.pdf
    • http://apartstmichel.com.ar/images/claim-roblox_GM431946152.pdf
    • http://apartstmichel.com.ar/images/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdf
    • http://apartstmichel.com.ar/images/how-do-you-get-free-robux-without-paying_GM431946152.pdf
    • http://apartstmichel.com.ar/images/coin-master-free-gold_GM406889139.pdf
    • http://apartstmichel.com.ar/images/coin-master-hack-without-verification-2021_GM406889139.pdf
    • http://apartstmichel.com.ar/images/how-to-get-free-robux-codes_GM431946152.pdf
    • http://apartstmichel.com.ar/images/get-robux-com_GM431946152.pdf
    • http://apartstmichel.com.ar/images/free-minecraft-mods_GM479516143.pdf
    • http://apartstmichel.com.ar/images/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://apartstmichel.com.ar/images/hacks-for-minecraft-bedrock_GM479516143.pdf
    • http://apartstmichel.com.ar/images/robux-com-free_GM431946152.pdf
    • http://apartstmichel.com.ar/images/coin-master-free-spins-generator-no-verification_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004947.bin
41458c293246da041b6449f1724f9d3e40488aa6715ac03aa45c526ad0458db2
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4947 25192 bytes
font_01_sfnt_off000083b9.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
pdf-font-stream PDF embedded font (sfnt) at offset 0x83B9 5596 bytes
font_02_sfnt_off00009061.bin
1e3fda203f08fe42ab00f6cef97e605bb68f7e374108f28afe3c353055d0c9d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9061 18012 bytes