Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc4ee9ee680c030…

MALICIOUS

PDF

42.6 KB Created: 2020-09-01 04:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9a95bff4cf6d964ab7443675068fb60 SHA-1: 6019ce4635af22b8803d6b66f81b3f3e5e660d46 SHA-256: 8fc4ee9ee680c03047c6335c28821541388da4fb3b2a6fb19918dc70c01f5aad
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, https://ttraff.cc/wix?keyword=bandura+et+al+pdf, which is a strong indicator of malicious intent. The document also features a large number of external links, many pointing to Shopify domains, suggesting a link farm or a method to obscure the true malicious destination. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click on the malicious link, likely leading to a further stage of attack.

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.cc/wix?keyword=bandura+et+al+pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9863/files/accounting_principles_procedures_mcq_and_answer.pdf
    • https://cdn.shopify.com/s/files/1/0436/9471/9131/files/94018495758.pdf
    • https://cdn.shopify.com/s/files/1/0428/3501/7884/files/gitajaboxemerebifilinaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/encode_file_to_base64_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/wuxisugufudapuxi.pdf
    • https://static.usrfiles.com/ugd/911c12_774e735f79384e1b8080482d2a797c8d.pdf
    • https://static.usrfiles.com/ugd/34e21e_adb694ea02d14f48a7c8a95988d3cd0f.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_df2aa6af4eef413d82a9d4609d2ed953.pdf
    • https://static.usrfiles.com/ugd/50c35f_1b491aa46c5c49f39c44338d57ec113d.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/60086341739.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1869/files/98622752109.pdf
    • https://static.usrfiles.com/ugd/61b8bf_0f253f37562246639e6f999f7a507f50.pdf
    • https://static.usrfiles.com/ugd/66c878_a1239754a76347cc91408f1912520905.pdf
    • https://static.usrfiles.com/ugd/cc14e4_45307a0fdf2b4f87952760d64861afe9.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_off00006ab6.bin
bcf93e6fcb0742b985d458883871090efc16aa842b7e8cec86d3a66abbb3f825
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB6 4908 bytes
font_01_sfnt_off00007b75.bin
67eedc3f8b282cbe6fe29604ef72f7bf09b859234085441dfb87b41514438205
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B75 10120 bytes