Malicious PDF — malware analysis report

Static analysis result for SHA-256 226fa99fb222b6e4…

MALICIOUS

PDF

43.7 KB Created: 2021-05-16 12:42:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 75d0e79fdb1c885e36197d61aaaf4941 SHA-1: 509d195596f00c74599c73863f5a69023ac2b52a SHA-256: 226fa99fb222b6e4e1c0438bfaaa2800d97311db38777a79c571161f0f5cdca3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to websites offering game cheats and free currency for games like Coin Master and Roblox. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The document body, though partially corrupted, contains a URL that aligns with the lure of free game items. The presence of multiple external links suggests a link farm designed to redirect users to potentially malicious content or download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/406889139/coin-master-free-link-today-game-hack PDF link annotation
    • http://asiasieja.pl/images/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-free-items_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-free-spins-april-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_003_off0000490a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x490A 28212 bytes
SHA-256: 3a6f4d208a04191de0bde7afac04765f432fcf45341345708ff9834adba83fef
font_01_sfnt_off0000887e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x887E 18232 bytes
SHA-256: ac7637c34b6ea6a17139aeea995219f6842183aaecfc204fce9d36f337c74847

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