Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec9555a2449aede…

MALICIOUS

PDF

42.0 KB Created: 2021-05-19 05:29:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f35d640a127f5ec0be8f8990902adb70 SHA-1: 7fc2d63365f6035c2ea9d5673f3739d2ffccc6cc SHA-256: bec9555a2449aede7463947dd456eb39da24002f65a8bbdaf5954032de4711ce
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are structured as SEO-optimized links to pages offering in-game currency or items for popular games. The primary URL, 'https://netcdn.xyz/app/1330123889/pubg-uc-and-skins-buy-game-hack', suggests a lure for game-related cheats or currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, reinforcing the idea of a link farm designed to attract users searching for game exploits or free items. The presence of a 'download button' heuristic further supports the malicious intent of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/1330123889/pubg-uc-and-skins-buy-game-hack
    • http://uctovnictvosnv.sk/images/how-to-get-free-roebucks-in-roblox_GM431946152.pdf
    • http://uctovnictvosnv.sk/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • http://uctovnictvosnv.sk/images/coin-master-free-spins-link-march-2021_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/coin-master-free-spins-link-2021-twitter_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/como-hackear-coin-master-2021-espaol_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/apps-for-free-spins-on-coin-master_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/free-spins-and-coins-coin-master-app_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/get-free-spins-coin-master-october-2021_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/robuxlove-net-free-robux_GM431946152.pdf
    • http://uctovnictvosnv.sk/images/coin-master-gold-cards-hack-english_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/minecraft-bedrock-edition-hacks_GM479516143.pdf
    • http://uctovnictvosnv.sk/images/free-spin-coin_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/coin-master-free-link-today_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/100-free-spins-coin-master_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/coin-master-hack-2021-android_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/free-robux-safe_GM431946152.pdf
    • http://uctovnictvosnv.sk/images/hack-coin-master-no-survey_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/www-coinmaster-com_GM406889139.pdf
    • http://uctovnictvosnv.sk/images/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • http://uctovnictvosnv.sk/images/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004570.bin
dae13818f317f3cd1db477594db47dafe3ca14b63ef650947110b0d10aef3209
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4570 26232 bytes
font_01_sfnt_off000080f2.bin
7f90dd4ac30f1910a9ba775572b59f562743750aaceeb7be3d6bbae90a588fe5
pdf-font-stream PDF embedded font (sfnt) at offset 0x80F2 18544 bytes