Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bd8df6deea2fbc…

MALICIOUS

PDF

36.4 KB Created: 2020-08-29 18:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a13c8f7b2159b25aa25e6492b2c9d7a SHA-1: 3684daa09f56dc6a4ffac75efdf63fbf57a975f3 SHA-256: b1bd8df6deea2fbc7a74a6857e734df2b2894a3de4684f02c2add4e97e699f18
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, however, directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a link farm designed to lure users to malicious content.

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.link/wix?keyword=boss+monster+2+online
    • https://cdn.shopify.com/s/files/1/0437/1477/3147/files/final_fantasy_x_blitzball_recruiting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/9760/2713/files/33557292175.pdf
    • https://cdn.shopify.com/s/files/1/0445/3515/2804/files/samsung_led_tv_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/0512/3493/files/23943910957.pdf
    • https://static.usrfiles.com/ugd/ace02d_30811d33b36647deb97315606234dae9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e09d8b6de35499d85ff50e2c54497e0.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/catholic_encyclopedia_vol_4.pdf
    • https://cdn.shopify.com/s/files/1/0435/4513/3215/files/sifil.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/86745912233.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3902/files/free_blank_table_of_contents_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/bobina_de_tesla_casera.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1147572b55143cc93c1682e22796521.pdf
    • https://static.usrfiles.com/ugd/b8c837_704ef12faca146379862905ae61921d5.pdf
    • https://static.usrfiles.com/ugd/89c6ad_3a2cd9855bef45ef9603968ba5935c29.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_off0000502e.bin
8c34493751148f512895c61abecf31bac819c833986b301c19e0d018c4f3c65c
pdf-font-stream PDF embedded font (sfnt) at offset 0x502E 4800 bytes
font_01_sfnt_off00006068.bin
c702a4a221686a77dd1fc0b8f78baf2ba0e04417a938ec52361a79f15184a018
pdf-font-stream PDF embedded font (sfnt) at offset 0x6068 10816 bytes