Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c33058d69a34dfd…

MALICIOUS

PDF

45.5 KB Created: 2020-08-28 11:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cc7cff0009b03d7da72c78291ed8bfd SHA-1: 13a61b484847a4f887d3e6f65a58ee484797e814 SHA-256: 5c33058d69a34dfdcd0ae78d27fff4325d284d784e20b22be4121ff3cc756f1f
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one prominent link leads to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to obscure the ultimate destination. The presence of embedded URLs and the link farm heuristic indicate an attempt to direct users to potentially harmful external content.

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/pify?keyword=reducing+fractions+to+lowest+terms+worksheet+pdf
    • http://gakel.howegate.co.uk/uploads/1/3/0/8/130874153/c4f7f5f65d5c93.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0441/1329/7560/files/95101216032.pdf
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/dufemujarat.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6760/files/94142198873.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/sjogren_s_syndrome_pathogenesis.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1832/files/pujuwijegede.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/livro_admiravel_mundo_novo_completo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/lofumelumobatukupagor.pdf
    • https://cdn.shopify.com/s/files/1/0438/7880/9755/files/moose_jaw_fall_recreation_guide_2018.pdf
    • https://cdn.shopify.com/s/files/1/0456/4503/7735/files/xisodibipafigoridirup.pdf
    • https://cdn.shopify.com/s/files/1/0438/1615/7344/files/filoboworikujidazog.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/civics_eoc_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/93497894493.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c45.bin
6f2e0666a5fcd34850be45f6f6bc6620996c9c111fd8b888331c8ccda49b69b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C45 5616 bytes
font_01_sfnt_off00005f3e.bin
fd12cf83361df96ab33066448b7d037194afcd74c78ace71f61a0bcc5e6db552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3E 10000 bytes
font_02_sfnt_off000081a4.bin
e61b0c5ea6c5551a2807e79b8f3d0e18c47627f6ca2f686e882f133310d1e61e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A4 17412 bytes
font_03_sfnt_off00009a4a.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4A 4324 bytes

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