Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa8fe8c24fd12e6…

MALICIOUS

PDF

52.0 KB Created: 2020-07-31 12:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ddf4b2b73a6fe90e9d7fc06c4124b52 SHA-1: d4b71a15c3c9ea6710e969c6773ba4b355c65e7f SHA-256: 5aa8fe8c24fd12e614818657c4f5c22cbe1f68cdced0d4fa8d6e7ad24d041721
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Sujok therapy points chart pdf'. The presence of many external PDF links, including benign ones on Shopify, indicates a link farm strategy to obscure the malicious redirector. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure.

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.cc/pify?keyword=sujok+therapy+points+chart+pdf
    • http://files.jobmasterrental.com/uploads/1/3/0/7/130776033/jinufurip.pdf
    • http://files.shellyginterconrad.com/uploads/1/3/0/8/130814984/569430.pdf
    • http://files.hseforum.nyc/uploads/1/3/1/3/131383657/3430608.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/35447925663.pdf
    • https://cdn.shopify.com/s/files/1/0428/5179/5107/files/54250155968.pdf
    • https://cdn.shopify.com/s/files/1/0434/7199/5030/files/61687643803.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/6902322603.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2981/files/zesapobunup.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/48004544178.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/nuroguxukukirawewib.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5372/files/79796634777.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/56135425546.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/lebafomoseze.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/semotuvonedonujati.pdf
    • https://cdn.shopify.com/s/files/1/0435/0381/2773/files/kodedewujoletakelozasur.pdf
    • https://cdn.shopify.com/s/files/1/0429/4675/6774/files/tujezasawarodarulezi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2275/9582/files/74129670634.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eb0.bin
ccb293c2e91cfe2f08c6b6c55f1ab95ad285dd5b374caf6db6e3587f15e7d464		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB0 5440 bytes
font_01_sfnt_off00008132.bin
4fe0f0b11d6f4e4a54e53c40332af441ca9faa2c8c930bb4a21eb858d773a450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8132 13852 bytes
font_02_sfnt_off0000acf4.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACF4 16204 bytes

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