Malicious PDF — malware analysis report

Static analysis result for SHA-256 6214f467be8fd1ae…

MALICIOUS

PDF

53.2 KB Created: 2021-06-11 02:41:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2c2b44f8a839dff226ebccda9b5de5bf SHA-1: 3400b57d48f2f594f89f1b86ee93fc523454dc56 SHA-256: 6214f467be8fd1aeb9b37660f853d4bf2380cb57ec7d72a9ad4b2cfb415ddf1f
142 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which are part of a link farm designed to appear as legitimate resources for game cheats and free Robux. The document impersonates Microsoft, indicating a credential phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9607

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/free-robux-no-verification-no-download-2021-game-hack.
  • 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-verification-no-download-2021-game-hack PDF link annotation
    • https://inspiration-modellbau.de/images/free-promo-codes-list-roblox_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/robux-robux_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/real-free-robux-games_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/roblox-prison-life-v2-02-hack_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-to-telecharging-a-website-of-hacking-on-roblox_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-robux-android_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-to-get-a-free-skin-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/roblox-prop-boat-free_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/robux-generator_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-to-hack-roblox-sql_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53BE 25860 bytes
SHA-256: 1c4fbf45c6a8b6d2917acabe3b5aad459ac8eae3573c7dc62e0cdc9b814dd7ba
font_01_sfnt_off00008fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAB 3964 bytes
SHA-256: f6b9a386ee4e0aff622a98b2230905da71eab0ca98398cb52018fda3528d3e2a
font_02_sfnt_off00009d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D09 3396 bytes
SHA-256: e59bc53cd4c0ee65dc1533becad2866f345dcb060e6c68bb8187d21cb9f973ee
font_03_sfnt_off0000a8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8FC 19584 bytes
SHA-256: 6d060c19cfdcabcdc6bddd80792e5ccefe5b0efd90c0cd3f16f1565492dd4e8c

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