Malicious PDF — malware analysis report

Static analysis result for SHA-256 7329c30bfb600664…

MALICIOUS

PDF

56.1 KB Created: 2020-09-02 02:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c2b66354d4e0b810fbe264d14fdfdc6 SHA-1: d837d94ded64fc2c152bbe43950de439ec715347 SHA-256: 7329c30bfb600664f3285794ecf709d1f608efc7f31d4f164618d6b0ce4b0a2c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links directs to a known malicious redirector. The document body contains garbled text but includes the malicious URL, suggesting an attempt to disguise or obfuscate the malicious intent. 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.ru/wix?keyword=bangla+gaan+dj+audio
    • https:///s/a10.gaanacdn.com/images/albums/89/2018089/crop_175x175_2018089.jpg,parental_warning:0,isSponsored:0,isAv_ad:0:0
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2664/4125/files/tegofu.pdf
    • https://cdn.shopify.com/s/files/1/0462/5255/6437/files/natokasoz.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/loximozofomazuwiwewedela.pdf
    • https://cdn.shopify.com/s/files/1/0436/9245/8152/files/taroxomatenodeposari.pdf
    • https://static.usrfiles.com/ugd/4b874d_5af9eaf2079646979b09a4b4396352f6.pdf
    • https://static.usrfiles.com/ugd/fd30ac_afefb820e97948b69c6bacb4e555a41e.pdf
    • https://static.usrfiles.com/ugd/e3c460_f3220e85da8b449eb1d018976a19b06c.pdf
    • https://static.usrfiles.com/ugd/76dd3d_8a35a09909a746d5951cd759ec934969.pdf
    • https://static.usrfiles.com/ugd/b8c837_5fc6c97f93bc4691a976cd63338b8b70.pdf
    • https://static.usrfiles.com/ugd/3f8d85_c54b49099064464a9c58cb0c53920a89.pdf
    • https://static.usrfiles.com/ugd/aff7ca_042d45749c964a649da1e597a61c2c43.pdf
    • https://static.usrfiles.com/ugd/225520_baf97d79e2fb4ba1a3b060f138cd3d52.pdf
    • https://static.usrfiles.com/ugd/74e9cf_97882463c925426996051427fb8b3daa.pdf
    • https://static.usrfiles.com/ugd/fe0276_673f0ffbc6c9442aaff08f00e60702eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_acbe67c5670a45ecb7dbe5837abaf431.pdf
    • https://static.usrfiles.com/ugd/0d2908_4a5a3621d23d415890a7fbd8ec3356f8.pdf
    • https://static.usrfiles.com/ugd/e745be_185b302eea0d4612abc8f61107a18ae6.pdf
    • https://static.usrfiles.com/ugd/6a7407_ad8266c6b4794df5a424a945758efa22.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009870.bin
2b83dcb731396207049fa2dfee2ce40474d0a9de70fe07b1e11234f59f966230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9870 4844 bytes
font_01_sfnt_off0000a902.bin
a035c5eb47e7cbc6719cae9e2bdc191adb47ef2ebebc28368db6beb8811cba51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA902 13460 bytes

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