Malicious PDF — malware analysis report

Static analysis result for SHA-256 398d50bbfc313259…

MALICIOUS

PDF

48.6 KB Created: 2021-06-09 17:23:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c66bad8a2063ef617bada5c05aee79ff SHA-1: 2d0f190f38ab646c597c83748a5d65cd6d07cccd SHA-256: 398d50bbfc31325996726f16fb3c8a5df01f30ddb5d554d45af6df02cff4b233
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are structured as a link farm pointing to other PDF documents. The document body and extracted URLs suggest a lure related to obtaining free virtual currency or game items, a common tactic for phishing and scams. While no scripts were directly extracted, the PDF structure and extensive link farm indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/how-to-get-free-robux-by-joining-group-no-buying-game-hack PDF link annotation
    • http://io24.com.ar/images/free-robux-pin-codes-pastebin_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-free-shirt-not-model_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/robux-free-hack-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/free-hockey-mask-roblox_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/claim-roblox_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/is-pokemon-go-fest-free_GM1094591345.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hacks-for-pet-food_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/cheats-for-getting-money-in-roblox-meep-city_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/como-ser-hacker-en-roblox-jailbreak_GM431946152.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_004_off0000522d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522D 26044 bytes
SHA-256: 0c5e809b31f3bd69238cf20fc5e21fa78f1f48135ff0f0df91c427a9dc5f78d5
font_01_sfnt_off00008eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAB 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off0000985a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x985A 19212 bytes
SHA-256: 9936bdcd88cd536507efe059ed9c224ec70ba816e249ca1ed320af1f329b786a

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