Malicious PDF — malware analysis report

Static analysis result for SHA-256 054f81239ae337ee…

MALICIOUS

PDF

41.4 KB Created: 2020-08-03 11:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 482abe022064b20999cb64939fa38bf6 SHA-1: e991a9f3929f88c84de7ff1f8f9226b3dda232f4 SHA-256: 054f81239ae337ee3007a759cbe2d3313508ba2c8e285e60de17f9a1bad5d11a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO abuse tactic. One prominent link directs to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness.

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=repair+and+disenchant+minecraft
    • http://files.waynepearsonglass.com/uploads/1/3/0/7/130740496/5032758.pdf
    • http://files.mitchgerber.com/uploads/1/3/1/8/131856398/xamawaxe.pdf
    • http://files.editmythesis.com.au/uploads/1/3/1/4/131452958/d9be2bc5583e0e.pdf
    • http://files.sarahglenn.com/uploads/1/3/0/7/130738894/dipedeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/benivat.pdf
    • https://cdn.shopify.com/s/files/1/0429/6084/7007/files/69873753848.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/pobitagezox.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/p90x_routine.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/56532367834.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/womoxufamawozijegukesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/tipasuginopapen.pdf
    • https://cdn.shopify.com/s/files/1/0434/5423/4785/files/xefemub.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/82946130590.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/23893268690.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_off00006362.bin
0d2ff08f5fa3517f622cc59d9c52310ff89f654594ecb48aa0815c309aeef381
pdf-font-stream PDF embedded font (sfnt) at offset 0x6362 5368 bytes
font_01_sfnt_off0000757e.bin
ea35de2e5e834ecd053255a86c03b01af09c127645edff2c3362306f01db7629
pdf-font-stream PDF embedded font (sfnt) at offset 0x757E 10364 bytes