Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afb879677ec22bd…

MALICIOUS

PDF

46.2 KB Created: 2020-08-12 03:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d037c1ef8bac40bca9ac9c5a9a98fbf0 SHA-1: fdd42026cd83ed35642f49330145a6a2e07ba9ec SHA-256: 5afb879677ec22bd891b28af5e08e92004bdc56a8a9ccedc0ad287273649e71f
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=auditoria+interna+definicion+pdf
    • http://files.nascidesigns.com/uploads/1/3/0/7/130775968/lebizoxuvibomo.pdf
    • http://femetaju.jgwebdesigns.net/uploads/1/3/1/6/131606289/6036312.pdf
    • http://files.jvsfinearts.com/uploads/1/3/2/3/132303035/6e187b5773.pdf
    • http://sapaviba.ceceliablenkerart.com/uploads/1/3/0/9/130969723/5833308.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0441/0572/8152/files/52079070331.pdf
    • https://cdn.shopify.com/s/files/1/0438/6396/5861/files/zanif.pdf
    • https://cdn.shopify.com/s/files/1/0429/3623/8236/files/71258865513.pdf
    • https://cdn.shopify.com/s/files/1/0438/2749/5074/files/pidikilikujakef.pdf
    • https://cdn.shopify.com/s/files/1/0440/3625/9990/files/agrger_des_fichiers.pdf
    • https://cdn.shopify.com/s/files/1/0428/2423/7212/files/xafumowef.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5881/files/71897928430.pdf
    • https://cdn.shopify.com/s/files/1/0440/9117/9160/files/libros_de_cabala_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0429/8457/1031/files/54274241775.pdf
    • https://cdn.shopify.com/s/files/1/0437/3784/1813/files/widozakidakela.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/tetafibijomeguri.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006722.bin
5d5de432a70d1a4b44d86ab7d6923758f72d4d1aa47702deb68408b55e242744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6722 4808 bytes
font_01_sfnt_off00007780.bin
8d00809ac18f7d0b7006b8f4298fec3376cbf769f6682a04eeb3cf2ed34e9e00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7780 11276 bytes
font_02_sfnt_off00009c07.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C07 4324 bytes

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