Malicious PDF — malware analysis report

Static analysis result for SHA-256 605f66a1968bcc55…

MALICIOUS

PDF

45.1 KB Created: 2021-05-19 15:00:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 45eb812a91395e7fe09d70ca37aa83de SHA-1: d98ebd00666c836537ff626269f238646c9cd007 SHA-256: 605f66a1968bcc5544759dd6b424e5bd18f4a9e2757085cb142e2d0f5bfb6c93
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to game hacks and cheats, indicating a lure for users to download potentially malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious sites, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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/479516143/play-minecraft-pocket-edition-for-free-game-hack
    • http://huananhai.net/images/coin-master-hack-unlimited-spins-apk_GM406889139.pdf
    • http://huananhai.net/images/coin-master-free-coin-hack_GM406889139.pdf
    • http://huananhai.net/images/free-robux-codes-no-verification-2021_GM431946152.pdf
    • http://huananhai.net/images/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • http://huananhai.net/images/free-magical-chest-coin-master_GM406889139.pdf
    • http://huananhai.net/images/free-robux-hack-no-verification_GM431946152.pdf
    • http://huananhai.net/images/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdf
    • http://huananhai.net/images/hacks-for-coin-master-game_GM406889139.pdf
    • http://huananhai.net/images/get-free-spins-coin-master_GM406889139.pdf
    • http://huananhai.net/images/hacking-apps-for-roblox_GM431946152.pdf
    • http://huananhai.net/images/minecraft-apk-114_GM479516143.pdf
    • http://huananhai.net/images/was-minecraft-ever-free_GM479516143.pdf
    • http://huananhai.net/images/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdf
    • http://huananhai.net/images/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdf
    • http://huananhai.net/images/coin-master-hack-xyz-apk-download_GM406889139.pdf
    • http://huananhai.net/images/free-generator_GM431946152.pdf
    • http://huananhai.net/images/free-roblox-dominus_GM431946152.pdf
    • http://huananhai.net/images/ways-to-get-free-robux-2021_GM431946152.pdf
    • http://huananhai.net/images/claim-free-robux_GM431946152.pdf
    • http://huananhai.net/images/how-to-hack-coin-master-game-ios_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a60.bin
10cba449f2676f2eb3925813d0db98e6447699cf5b8de17a9d41db1fcf88cd87
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A60 24820 bytes
font_01_sfnt_off000082d4.bin
dd24a0ab94df4552e459bd06fd01b0fd3f021c1d51d1d64407070e735974a028
pdf-font-stream PDF embedded font (sfnt) at offset 0x82D4 3056 bytes
font_02_sfnt_off00008d47.bin
6c649d819020132e6c1bf6337a465c0b09cd39993cd953cd91e9ee42e31cc7d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D47 18460 bytes