Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8f4e99b7cefa87…

MALICIOUS

PDF

42.9 KB Created: 2020-08-13 10:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b9dfbbc0feccd512a63718e783aafd6 SHA-1: 1cf8afdfe8bc2b60c0585634d3ba328c72500dca SHA-256: 1a8f4e99b7cefa87be9bf523f9b742255a9a373d2a788e62db47962172ae4dad
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of SEO-optimized links pointing to external PDFs, indicating a link farm for traffic manipulation. The primary malicious URL is https://ttraff.com/wb?keyword=servo%20controlled%20voltage%20stabilizer%20pdf, which is designed to redirect users to further malicious content. The document body itself is largely unreadable due to encoding issues, but the presence of the malicious link is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=servo%20controlled%20voltage%20stabilizer%20pdf
    • http://files.lindastcviteachershare.com/uploads/1/3/1/3/131379639/9957935.pdf
    • http://rupebiw.creativo-school.com/uploads/1/3/1/1/131164538/tewizegif-gazuditamapaj-tazatanilebi.pdf
    • http://files.siverafont.org/uploads/1/3/2/6/132681229/xoravopufabijorak.pdf
    • http://sigobofu.terraceminorsoftball.com/uploads/1/3/2/7/132741099/sejafiredar.pdf
    • https://cdn.shopify.com/s/files/1/0438/2271/0941/files/vakefegutubevesil.pdf
    • https://cdn.shopify.com/s/files/1/0447/9556/0096/files/flexbar_tennis_elbow.pdf
    • https://cdn.shopify.com/s/files/1/0430/9080/4893/files/nekukobaseputunolo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6960/4001/files/62883013252.pdf
    • https://cdn.shopify.com/s/files/1/0433/6579/3942/files/complete_bodybuilding_program.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/78808241231.pdf
    • https://cdn.shopify.com/s/files/1/0436/4566/5433/files/20001869202.pdf
    • https://cdn.shopify.com/s/files/1/0439/2484/8795/files/lugavijetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1905/0908/files/14339356382.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/wusagoluvit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685258811.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8171/files/lasirizonaxarix.pdf
    • https://cdn.shopify.com/s/files/1/0435/1043/1896/files/96539335234.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_off000068ef.bin
4923e5525533aa0ae5695c903fd81d87971d1242b5adab9caf78e801806db9a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EF 5676 bytes
font_01_sfnt_off00007c56.bin
25913df0222e2d5d808aeb15fbed683355cbdabc7a6931cc00a9fee3a21f3628
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C56 10020 bytes