Malicious PDF — malware analysis report

Static analysis result for SHA-256 f437930ea552463e…

MALICIOUS

PDF

45.2 KB Created: 2021-05-13 14:02:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3c3e71a7149705768fd6ba2936da9afd SHA-1: 53e536e6fa1e49a40043051ee09aa1564c893491 SHA-256: f437930ea552463eef69f13a465bc14c774f6863e9829d46fa315b86bbd7b14b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-themed and point to game-related cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

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/406889139/legit-coin-master-hack-october-2021-game-hack
    • http://caraless.com/images/roblox-promo-code-to-get-free-robux_GM431946152.pdf
    • http://caraless.com/images/actual-free-robux_GM431946152.pdf
    • http://caraless.com/images/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • http://caraless.com/images/free-robux-working_GM431946152.pdf
    • http://caraless.com/images/free-spins-for-coin-master_GM406889139.pdf
    • http://caraless.com/images/free-robux-by-watching-ads_GM431946152.pdf
    • http://caraless.com/images/minecraft-free-school_GM479516143.pdf
    • http://caraless.com/images/boost9-com-roblox-hack_GM431946152.pdf
    • http://caraless.com/images/free-roblox-accounts-with-robux_GM431946152.pdf
    • http://caraless.com/images/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://caraless.com/images/coin-master-free-coins-and-spins_GM406889139.pdf
    • http://caraless.com/images/blogger-coin-master-free-spins_GM406889139.pdf
    • http://caraless.com/images/free-minecraft-skin-maker_GM479516143.pdf
    • http://caraless.com/images/free-robux-without-human-verification-real_GM431946152.pdf
    • http://caraless.com/images/hack-para-coin-master-singapore_GM406889139.pdf
    • http://caraless.com/images/coin-master-free-spins-hack-download_GM406889139.pdf
    • http://caraless.com/images/coin-master-free-cards-link_GM406889139.pdf
    • http://caraless.com/images/free-robux-come_GM431946152.pdf
    • http://caraless.com/images/coin-master-play-online-free_GM406889139.pdf
    • http://caraless.com/images/online-coin-master-free-spin-app_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004abf.bin
1946d7218678b2480d371b71bdb7461a4846aa1e96687161387e9e25f7d2fed2
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ABF 24560 bytes
font_01_sfnt_off00008311.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
pdf-font-stream PDF embedded font (sfnt) at offset 0x8311 2880 bytes
font_02_sfnt_off00008cfc.bin
56b4f24fc9847ca249e337f5cec44192b38f8002a6131b91275db6b901cbab0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFC 18564 bytes