Malicious PDF — malware analysis report

Static analysis result for SHA-256 90744ad8e8b467bb…

MALICIOUS

PDF

42.9 KB Created: 2020-08-29 11:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14e55eef9e57e48af2f4527a3ee3770c SHA-1: b3467d9efab80af98516ca96b81ef5d29f3c17a1 SHA-256: 90744ad8e8b467bb30829aa4a5f3779a548862a498e6f50f0089d2176fdeed39
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to direct users to a malicious redirector at https://ttraff.me/wix?keyword=answer+for+clash+royale+quiz+game. The document body, though heavily obfuscated, contains text related to a quiz game, suggesting a social engineering lure. The presence of numerous links to other PDFs, many hosted on Shopify and static.usrfiles.com, indicates a link farm strategy to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.me/wix?keyword=answer+for+clash+royale+quiz+game
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/42712994358.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9488/files/watiledaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/22550408828.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6965/files/class_12_cbse_chemistry_ncert_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/natusokekawitafarubejiv.pdf
    • https://static.usrfiles.com/ugd/b8c837_86aeb39a92184ebe99ba87586b5a36cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_fafa41c826854254940890c10bed8360.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e4ed6d1e52349b0913d6c94bb1d105c.pdf
    • https://static.usrfiles.com/ugd/b8c837_bfe44046cfd9472a99c9ef7c59baaaf9.pdf
    • https://static.usrfiles.com/ugd/b8c837_ebe7f6baeb774a73bb005ae56c2c3c00.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd09c383339a480bb46b21b5c0a4a224.pdf
    • https://static.usrfiles.com/ugd/b8c837_503930efaa134338ab701eb24487daf0.pdf
    • https://static.usrfiles.com/ugd/9cc572_e3e42f034f31497b9314ad4e13c647a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ef1c7640ec44b888fef8b6112cae54d.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c244571d95a4d5ea1e7cb46890a45f7.pdf
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/44604927232.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/48487210408.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/hong_kong_monthly_weather_reports.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000846b.bin
965f5ae1e36b5f602e8a8033d375670f911ecc72c1515ebcba200e6255da27f9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x846B 17368 bytes
font_00_sfnt_off00004e4c.bin
f206f8cd58dad8d0a27b84041b5e4af63ed7fbf8d5107f92ec1efc4365dbdd04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E4C 5652 bytes
font_01_sfnt_off00006178.bin
6fc639706264d8ee70932370bb5d5a5bc98f396ab3d5e6ac26e94549020b9dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6178 10248 bytes

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