Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7f257555d82686…

MALICIOUS

PDF

39.3 KB Created: 2020-08-07 10:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa74ae72ee4cb0907f31bfa396bdde96 SHA-1: 0bd342e3aafaa71c586d65f01e58cb00070aa0e0 SHA-256: 3d7f257555d82686ceee6c8ec7061dcc41df9fe895b5bbd29bb625387aac7378
128 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for 'creative writing worksheets for grade 2 pdf', and includes the malicious redirector URL. This suggests the document is designed to trick users into clicking the link, leading them to malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=creative+writing+worksheets+for+grade+2+pdf
    • http://files.johntherev.com/uploads/1/3/0/7/130738914/2442753.pdf
    • http://files.utahpeers.org/uploads/1/3/0/7/130775897/rotifuwajalumi.pdf
    • http://kafekamok.stannersenglish.com/uploads/1/3/0/9/130969656/bopiri.pdf
    • http://files.farleycameronart.com/uploads/1/3/0/7/130775862/42cebc237570d.pdf
    • http://jurapoka.yourvapesupply.com/uploads/1/3/1/3/131380058/2136281.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/lunetosuwasagu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7214/4038/files/jeguziwememabuganopixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/biomedical_waste_management_in_hospitals.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/paulo_coelho_aleph_romana.pdf
    • https://cdn.shopify.com/s/files/1/0429/5219/6249/files/vaxof.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/lubipalezanuradadubupoxan.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/gebubozebezel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kilezolesosobusafo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/vumobaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6646/files/code_block_discord.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/4764338826.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/pujoji.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/all_accounting_ratios_formulas.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_off00005a70.bin
c8cd970bffa3cfcdfa6f42dfcdb519a9fb30f86f719d2959a57f46ffba8e6afb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A70 5524 bytes
font_01_sfnt_off00006d50.bin
f86b59bb8823bc9b8ec21edafad85ce995f3fb8c7abf0d9402f42ea1e4a0845c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D50 10180 bytes