Malicious PDF — malware analysis report

Static analysis result for SHA-256 a810bb8779be7333…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 08:46:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dee68610b4e820db3e5266f396a2d4bd SHA-1: 64858b35f57acd94796dd7be17899ec7a6ae5ecd SHA-256: a810bb8779be7333d9c633c10d9624f6d5c6852c9e03aa5cf51c6a52077f7a65
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are structured as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The document body and extracted URLs explicitly mention "free Robux" and "free spins," indicating a common lure for scams or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/free-robux-no-inspect-or-waiting-game-hack PDF link annotation
    • https://inspiration-modellbau.de/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-roblox-skin-maker_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/regular-free-robux_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-cafe-groups-on-roblox_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/mad-city-roblox-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-promo-codes-list-roblox_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/roblox-teleport-script-hack_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-to-become-admin-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/roblox-redeem-card-hack-2021_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-robux-inspect-element-2021-pastebin_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-to-download-minecraft-hacks_GM479516143.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_004_off0000516a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x516A 25544 bytes
SHA-256: ed57bbe2a88b2d1d60347fdf8174a6796dff516294ea95a72a3ffaa2b6b81cd8
font_01_sfnt_off00008b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B90 19128 bytes
SHA-256: e8e4f7391e48f69a1ef2070a6160608f9a6ab3007b918e0707a746eff86866f5