Malicious PDF — malware analysis report

Static analysis result for SHA-256 160f90d3f796ac5f…

MALICIOUS

PDF

91.9 KB Created: 2020-08-05 05:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 406b084bce3245e691fc6b2be2a4b046 SHA-1: c968a3505131c10f61f114a8ac7906867d18c126 SHA-256: 160f90d3f796ac5f7d5cf2c8420529f12adbaac4a2e89da81f63ca51ff69f843
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The PDF also contains a large number of links to other PDFs, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports this assessment.

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.com/wb?keyword=principal%20component%20analysis%20and%20factor%20analysis%20pdf
    • http://files.heatherlabbeart.com/uploads/1/3/2/7/132712214/lixerogiv.pdf
    • http://files.anjisart.com/uploads/1/3/1/4/131453871/7936305.pdf
    • http://mupelemer.revolutionaryscience.org/uploads/1/3/2/3/132302780/a385a3d28e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8574/9654/files/p_square_shekini.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5135/files/65823393647.pdf
    • https://cdn.shopify.com/s/files/1/0436/2806/9017/files/cinema_4d_animation_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/1257/0787/files/puxiso.pdf
    • https://cdn.shopify.com/s/files/1/0443/1472/2460/files/script_writing_format_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/5317/7237/files/firoduzagebisalepig.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/85553674165.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/tibudokojefepenevuli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51994241049.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/18595349138.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/lugiwezusikuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9108/2918/files/xuboniletunujobuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/1415414921.pdf
    • https://cdn.shopify.com/s/files/1/0429/5753/7439/files/53103211926.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_off000108e0.bin
6122194027425e8aa4170774e84cb1170befef931d204d24c395449948779db8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 5404 bytes
font_01_sfnt_off00011b34.bin
a09b124f0c033bcb6c4f281d7229d7be84210f5f2126b5c72d0b9bc14cfcfcd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B34 15120 bytes
font_02_sfnt_off00014bf0.bin
a7250320fc1433e685b8cdb5035509d01c6ff28c7143126c31c082aef3222939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF0 16280 bytes

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