Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c71ed79a08e1b8f…

MALICIOUS

PDF

61.6 KB Created: 2020-08-09 01:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61a4a4782baa747a9f6eae556a42fddf SHA-1: 7663f836b340e1bb428fc68d55e76568e27532d1 SHA-256: 6c71ed79a08e1b8f3eadfad3965016ef19593ff3f105bef0a80089dec52774a7
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with a primary link pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

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=blanc+manger+retro+pdf
    • http://files.ncaaop.com/uploads/1/3/2/3/132302824/67987eb.pdf
    • http://durog.shoremakesscents.com/uploads/1/3/1/6/131636612/d8da454e7d9dfdc.pdf
    • http://lukonewad.relentlessknitting.com/uploads/1/3/0/8/130874359/dexiw_negutalip_kituzejofasede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1254/6975/files/material_design_shadows.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/61690254324.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1724/files/92856735357.pdf
    • https://cdn.shopify.com/s/files/1/0433/9610/4341/files/dusaxote.pdf
    • https://cdn.shopify.com/s/files/1/0445/5786/1023/files/statistical_analysis_with_excel_for_dummies_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/xuwakenumexuzixaxoru.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/40034345386.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/pdf_file_opener_download_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/8118/6971/files/19013925664.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_off0000b40f.bin
7b78d9428ffdc6cf51996ebce39b264d928500ab0080237ddb4cf1cd84d1fd01
pdf-font-stream PDF embedded font (sfnt) at offset 0xB40F 5344 bytes
font_01_sfnt_off0000c626.bin
16b2c4955a8d5013585e1a7de78a56add9ec6d825191a96297f973b9955ca771
pdf-font-stream PDF embedded font (sfnt) at offset 0xC626 10436 bytes