Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cda7fcc3a9e4c4…

MALICIOUS

PDF

44.7 KB Created: 2020-08-08 17:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 107625baa110dd0e2f3b698000662fb0 SHA-1: b59f5071beb1a796d25f20f66214d4c19da0498d SHA-256: c6cda7fcc3a9e4c4459760ec5fd20302f6b0bb1d976b18637264b44028b0a383
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links, 'https://ttraff.com/pify?keyword=b.+com+sem+3+books+pdf+mumbai+university', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be a garbled representation of the link text and metadata, suggesting it was generated programmatically to host these links.

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=b.+com+sem+3+books+pdf+mumbai+university
    • http://lefudil.buysanfordrealestate.com/uploads/1/3/1/4/131407005/72a8190.pdf
    • http://files.floridalcsw.com/uploads/1/3/0/9/130969656/e493a89.pdf
    • http://boketedu.storylabgeographic.com/uploads/1/3/1/4/131453215/4175352.pdf
    • http://files.jordandeadseaminerals.com/uploads/1/3/0/9/130969231/815595.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/nemopifipatisanuku.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/96347004741.pdf
    • https://cdn.shopify.com/s/files/1/0433/5465/2822/files/bioterios_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gobobuxewinunegurugita.pdf
    • https://cdn.shopify.com/s/files/1/0435/1482/2811/files/99912836185.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8357326041.pdf
    • https://cdn.shopify.com/s/files/1/0429/1179/3315/files/sivasuvove.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/59545293110.pdf
    • https://cdn.shopify.com/s/files/1/0432/6565/4946/files/bewudinovirivojiwil.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2125/files/ralunibudemelimifefutem.pdf
    • https://cdn.shopify.com/s/files/1/0434/8225/1421/files/rivexivofitotetobowumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/sodunemazukojijo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/janok.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
font_00_sfnt_off00005666.bin
a9f5536dc0e88b13cfdb6bac46dbdf63d214c34b348551e109da565c96aaa050		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5666 5760 bytes
font_01_sfnt_off000069f3.bin
4c7aa684ef60ff7f7c942fa99235eae871221ffc68f7b6a1a7875ef4b9ab008f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F3 13752 bytes
font_02_sfnt_off0000952c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x952C 4324 bytes

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