Malicious PDF — malware analysis report

Static analysis result for SHA-256 71987cad7b1e6ac3…

MALICIOUS

PDF

41.2 KB Created: 2020-08-02 23:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2ffc69dce4f22763095e9ce90c28883 SHA-1: 3da7acf9cf01d9d75be277395b77d4df00332ace SHA-256: 71987cad7b1e6ac333e381081e99d781a6312ae4d80679ca570474dca7ffebd8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file contains a large number of embedded links, many of which point to a known malicious redirector. The primary purpose appears to be to direct users to malicious websites, potentially for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL supports this assessment.

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=something+corporate+konstantine
    • http://files.stjosepherie.com/uploads/1/3/0/7/130775145/7312c.pdf
    • http://files.getfitnation.org/uploads/1/3/2/6/132681824/gusinabope.pdf
    • http://files.gettinglostinthewoods.org/uploads/1/3/1/4/131453623/80505ebcf64e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0446/5029/9555/files/transfer_google_authenticator.pdf
    • https://cdn.shopify.com/s/files/1/0428/5543/2348/files/bozebemugefemikikifezop.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/68027117251.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/mitubujekire.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/29944081743.pdf
    • https://cdn.shopify.com/s/files/1/0432/0913/0143/files/vezulaxonofenekax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0432/5018/8443/files/pedev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9160/8227/files/3765170628.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/monolagolamebidemadej.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/20753334534.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_off0000632e.bin
1d565e07455818c93c11ad89025bbff2ed69f8f679bccb49fb35c6443e351d0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x632E 5480 bytes
font_01_sfnt_off000075aa.bin
75853b733234f71de93421f6b0667ac56f359c5fed6880477d2e5e9708310a75
pdf-font-stream PDF embedded font (sfnt) at offset 0x75AA 10108 bytes