Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb98c8ebb99bbeb…

MALICIOUS

PDF

48.2 KB Created: 2020-08-07 09:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e1996838a2c53ae09f438dd65d932dc SHA-1: fdafca0611a5c5f79d2f3552459a0cabf72e7562 SHA-256: 6bb98c8ebb99bbeb6b81ca617a6d52cf26b8a8524231b81c9a3477d7058f038b
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified as a redirector. This suggests an attempt to trick users into visiting a harmful site, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URL and heuristic firings point to a social engineering attack.

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=pdf+editor+free+online+tool
    • http://tekoluven.appliedbiochemists.com/uploads/1/3/0/8/130874330/139912.pdf
    • http://files.thefitnessmasters.com/uploads/1/3/1/3/131398292/vugutozos.pdf
    • http://files.keysboatdocks.com/uploads/1/3/2/7/132712015/8512c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/definition_of_chronic_liver_disease.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/kagelaxiwa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/71549522119.pdf
    • https://cdn.shopify.com/s/files/1/0435/9300/7272/files/modubojexowegufojufo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/97572134453.pdf
    • https://cdn.shopify.com/s/files/1/0436/2865/8848/files/pasifusofagetoriwalujazis.pdf
    • https://cdn.shopify.com/s/files/1/0431/6138/7170/files/sisumofiwesiwuvak.pdf
    • https://cdn.shopify.com/s/files/1/0432/0188/8416/files/76157602396.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0629/files/46893828176.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/test_1879eb6a-339e-4d45-a409-571cd94a4742.pdf?v=1594212285
    • https://cdn.shopify.com/s/files/1/0434/3247/6838/files/bicsi_tdmm_13th_edition.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008111.bin
75244022980e42c4e9b48806b59591b62010b02f8dda1bc33f643af8665e5269
pdf-font-stream PDF embedded font (sfnt) at offset 0x8111 4516 bytes
font_01_sfnt_off00009079.bin
1bcb66640fb79d1f55881a1fa8d9581dcb26aed96b29df9e0bd484b2658a87ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x9079 10388 bytes