Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8992165efaeaaa…

MALICIOUS

PDF

45.2 KB Created: 2021-06-09 03:20:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f5263b8d38b0d18b000c5e37c5a92742 SHA-1: 5a1593bd61d93e011227a2c70498f79627bf5a40 SHA-256: ff8992165efaeaaa888e11e3ff67c2a03fa48431cfcc7b183e706c65613e9d48
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, specifically impersonating the PayPal brand to trick users into clicking links. The embedded links, such as 'https://netcdn.tw/app/431946152/roblox-wls-3-hack-game-hack', and the extensive link farm hosted on 'sapaengineering.kz', suggest an attempt to redirect users to malicious sites for credential harvesting or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/roblox-wls-3-hack-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/roblox-wls-3-hack-game-hack PDF link annotation
    • http://www.sapaengineering.kz/images/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/how-to-get-good-clothing-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://www.sapaengineering.kz/images/coin-master-free-pet-food_GM406889139.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_off00005120.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5120 25972 bytes
SHA-256: ed82a9f8c9cf4ffc9e417b5f5a852f94f1ca92feeabdfa971497df6b855020f6
font_01_sfnt_off00008d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0B 18556 bytes
SHA-256: 5986f6c567d09d16f189254cb1a3bdd1297bdcf09a7b59537379fea20aaa0a52

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