Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8bf17c2b9df8fe…

MALICIOUS

PDF

57.3 KB Created: 2020-08-31 09:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9baca7acaa08384cb4cfd24aa2c8acda SHA-1: 4cf60290ef6023f2d5b1a333fef6c25ba6a1e853 SHA-256: 8f8bf17c2b9df8fe79affa9971c48a61ecbd75309869e3acc9d97c221c04a9d1
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF file contains a lure related to a job resignation letter, which is a common social engineering tactic. It embeds multiple links, with one critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=job+resignation+letter+format+in+kannada+pdf'. Another heuristic flags a large number of embedded PDF links, many hosted on cdn.shopify.com, suggesting a link farm or distribution mechanism. The document body, though heavily obfuscated, contains the malicious URL.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=job+resignation+letter+format+in+kannada+pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0451/2792/5925/files/veguneribamope.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2102/files/business_report_example_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/10357876190.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/download_aadhar_card.pdf
    • https://cdn.shopify.com/s/files/1/0438/3201/7058/files/78404437416.pdf
    • https://cdn.shopify.com/s/files/1/0433/0432/1184/files/xufizololegubopaboramen.pdf
    • https://cdn.shopify.com/s/files/1/0435/1275/8426/files/10620128760.pdf
    • https://cdn.shopify.com/s/files/1/0428/0044/7655/files/midufirewamu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/abc_coloring_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/33912523811.pdf
    • https://cdn.shopify.com/s/files/1/0433/7664/0156/files/tuterasepefixora.pdf
    • https://cdn.shopify.com/s/files/1/0457/4088/4124/files/33645265833.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/averrhoa_carambola.pdf
    • https://cdn.shopify.com/s/files/1/0433/2306/4488/files/electrostatic_boundary_conditions.pdf
    • https://cdn.shopify.com/s/files/1/0465/4576/4510/files/54014561734.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/kezegoxemizinonizo.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_off0000a148.bin
887f234097d27373a7112a13abe06bebfa40cc4ed29692e69805dd91aad37732
pdf-font-stream PDF embedded font (sfnt) at offset 0xA148 5552 bytes
font_01_sfnt_off0000b407.bin
0a1c767efa6fa8fc5177b3862da51cfb8fa3f280a660c2a52e4887b0c1a8ee53
pdf-font-stream PDF embedded font (sfnt) at offset 0xB407 10576 bytes