Malicious PDF — malware analysis report

Static analysis result for SHA-256 910d2783cde21bdd…

MALICIOUS

PDF

39.8 KB Created: 2020-08-30 10:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b4649fd27e0269232aab7c477e8c90d SHA-1: 2348c780fa22aab8157d6f09842afd30b4e44e67 SHA-256: 910d2783cde21bdd946847b49e8123cf9bac36ccbd54fcb5a37e2eb9951c53e1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.me'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to Shopify-hosted PDF files. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern appears to be the distribution of malicious links disguised within a seemingly innocuous document.

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=comment+representer+le+sable+en+peinture
    • https://cdn.shopify.com/s/files/1/0428/1221/1359/files/worldfree4u_bollywood_movies_hd_2017.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/biology_matters_textbook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43127542751.pdf
    • https://static.usrfiles.com/ugd/4ae4db_0c455177de96484ab2f65a34010c9bb8.pdf
    • https://cdn.shopify.com/s/files/1/0436/2492/3298/files/83850947340.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/lesekiwuwumivepawuvezese.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/trends_across_the_periodic_table.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/19859942749.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/nuvugugunuruvakejonejid.pdf
    • https://cdn.shopify.com/s/files/1/0449/9865/6158/files/harvest_moon_another_wonderful_life_rom.pdf
    • https://cdn.shopify.com/s/files/1/0431/6099/3943/files/www_starmusiq_com.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_off00005bfa.bin
a5dc87d3cc16515460f5ba934d2bd7d76497461b6d6d51870dc346365665c055
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFA 5012 bytes
font_01_sfnt_off00006cdc.bin
c11468b5aa2b0ad0296977eee3faedfcf264596f7c1a429d6043ff8040a16f1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDC 11608 bytes