Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d84af52c119335…

MALICIOUS

PDF

35.0 KB Created: 2021-07-02 01:03:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3359ca003e2746c2eaff063cc7c0ed5f SHA-1: 81510145964838aaa0616b334a8bb7a5b39bfa3f SHA-256: b1d84af52c119335b390c300be6c37a73b3230ff4883b232fcacf711f39820db
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are SEO-optimized and point to pages promising game-related cheats and currency. The document body and extracted URLs suggest a scam or phishing attempt to lure users to click these links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-hacks-to-get-free-robux-2021-game-hack PDF link annotation
    • http://cintabaca.org/katalog/repository/free-robux-no-human-verification-2021-no-download_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/guuuddinfo-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/no-click-cheats-for-roblox-jialbreak_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/unlimited-robux-and-tix-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/are-there-any-actual-robux-cheats_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-use-cheat-engine-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-hack-generator-app_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/instantrobux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-codes-for-toys-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-app-apk_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-generator-no-human-verifascation_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-on-samsung-tablet-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3210 21764 bytes
SHA-256: 79339bd579e05ccabd32458e6ad114156219d0ae70ec0d20ea649befe27ac372
font_01_sfnt_off00006279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6279 19468 bytes
SHA-256: d9cc5021580f34b8e865f8e6271aab79b5d646b82110a1b81b5e898ee6d0f046

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