Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21c06de917ea0c7…

MALICIOUS

PDF

44.6 KB Created: 2021-06-08 13:36:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cbbd344107230e1feea4e7c76a8c0b0f SHA-1: f4cd6128c0f14f5c54c63a8d3a667faa27cde3fa SHA-256: b21c06de917ea0c78d5caea672566844b7dc5ac2a9399f802c704853eaf7fdb9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a credential phishing lure impersonating the brand UPS, directing users to click a link for free in-game currency. The embedded link farm suggests a broad campaign to lure users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links points to a malicious workflow designed to exploit user interest in free items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/cmo-hackear-el-roblox-para-tener-robux-en-un-mvil-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/cmo-hackear-el-roblox-para-tener-robux-en-un-mvil-game-hack PDF link annotation
    • http://sbm-nn.ru/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-phantom-forces-hack-aimbot_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/pubg-uc-buy-in-pakistan_GM1330123889.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-bubble-gum-leviathan-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/hack-blob-sim-2-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-2021-ios_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_off00004ed8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ED8 24976 bytes
SHA-256: c3849564f971f6c57ed0e225a26c6c43269c715fb3eca0a6d9223fc06c2114ab
font_01_sfnt_off000088ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AC 19352 bytes
SHA-256: 4bb7c89e979dbf0a944e57a578f67b30bb0185adfaac6cea5c482d5524295a47

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