Malicious PDF — malware analysis report

Static analysis result for SHA-256 5345fa4d2ee8d903…

MALICIOUS

PDF

49.9 KB Created: 2020-07-20 03:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aeb24cd9f44d110966336ce39786aaa SHA-1: 7b29c685cb6b9f736e6e3a9fac7c7c7f2d567715 SHA-256: 5345fa4d2ee8d903b196f37798486664ed2ddc8d69d0428223aff602994ea1d2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, a technique commonly used in SEO link farms to manipulate search engine rankings or distribute malicious content. One of the embedded URLs, https://ttraff.cc/wb?keyword=sistema%20urinario%20en%20animales%20pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the link farm and the malicious redirector strongly suggest a phishing or malware delivery attempt.

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.cc/wb?keyword=sistema%20urinario%20en%20animales%20pdf
    • http://files.yourlushgarden.com/uploads/1/3/0/9/130969987/5245057.pdf
    • http://files.grottocreations.com/uploads/1/3/1/1/131163684/8665499.pdf
    • http://files.duanebrownlaw.com/uploads/1/3/1/4/131483253/2887604.pdf
    • https://navofifur.files.wordpress.com/2020/07/xupejor.pdf
    • https://tejunif.files.wordpress.com/2020/06/fapuginexizimapizofomude.pdf
    • https://disoferaw.files.wordpress.com/2020/06/mabuximeraxab.pdf
    • https://juxolaf.files.wordpress.com/2020/07/dorofoxa.pdf
    • https://ladubine.files.wordpress.com/2020/06/88612643173.pdf
    • https://jixuvozigip.files.wordpress.com/2020/07/31877172757.pdf
    • https://kikinanatus.files.wordpress.com/2020/06/lapipawo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/gawupogudajezowexigideb.pdf
    • https://cdn.shopify.com/s/files/1/0435/6843/1265/files/86513130393.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/furekekafabenuge.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/lolirawomenijokareles.pdf
    • https://cdn.shopify.com/s/files/1/0431/3225/6407/files/67633856191.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/85860252330.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9155/files/49871779828.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32867625585.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/peduvonuvebazameveno.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087a1.bin
2e7472991cd1514a7673c6be20e516cfec3521a1e65bd42ac1bf0b29d5b1dcca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A1 5172 bytes
font_01_sfnt_off0000990f.bin
df7b2c0d0fed8facd122287f95f0a840b77a84f993b1002a246f7dfe742c73e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x990F 10164 bytes

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