Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c77019e6afb19f…

MALICIOUS

PDF

39.9 KB Created: 2020-09-07 02:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7b161e40b4deba004e55b6187aaa5ed SHA-1: e41390c6721450a610510f08e2104f323785c0d5 SHA-256: 83c77019e6afb19f8051cfc167b4ca7763cd79e0575296b44df0c121b9aaccf5
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.me/wix?keyword=new+movie+counter++2019'. This URL is presented within the document body, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=new+movie+counter++2019
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/wombat_stew_activity_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/vozenuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/kiruzux.pdf
    • https://cdn.shopify.com/s/files/1/0461/4337/3480/files/laruzegosinifubifepizedes.pdf
    • https://cdn.shopify.com/s/files/1/0432/7371/5870/files/2007_gmc_acadia_reviews.pdf
    • https://cdn.shopify.com/s/files/1/0439/2956/7387/files/lagu_addinu_lana_at_taufiq.pdf
    • https://static.usrfiles.com/ugd/12daa7_d326a3cf38174bf49844040c3f9aef37.pdf
    • https://static.usrfiles.com/ugd/850f07_165632e6d614481f98b9017310bff76a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c5d0e8ef8cc449fb11bb7d577dc25a8.pdf
    • https://static.usrfiles.com/ugd/110ef3_a58f67e6125c47509549b4213378789a.pdf
    • https://static.usrfiles.com/ugd/a891c0_7a0244dd5f914f42b9dda429cacaafef.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/25760210128.pdf
    • https://cdn.shopify.com/s/files/1/0428/9826/0124/files/53855389619.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/watch_yu_gi_oh_gx_online.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_off00006023.bin
e85e74c0b5f7e217c21e125df5e6112cbdf548cddf4649d8e1cb36640374423b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6023 5128 bytes
font_01_sfnt_off000071a7.bin
73d24ae2cbc91580a291fc8d6d95806dd2c8ca090aad6112ad85a4e41e7f9ecc
pdf-font-stream PDF embedded font (sfnt) at offset 0x71A7 9772 bytes