Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f77f20b8253b6e4…

MALICIOUS

PDF

45.1 KB Created: 2020-08-19 07:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 000391def6fce81f25b19bb0d314cc85 SHA-1: e8e0e1943fd76b3851a4406ccb915fd0cae303ac SHA-256: 3f77f20b8253b6e478e3826717c7d90d5e64874e830105ba1912164f5e4125aa
160 Risk Score

Malware Insights

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

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 the URL 'https://ttraff.cc/pify?keyword=bearer+authentication+format', which is likely used to redirect the user to a malicious site. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests that this PDF might be part of a multi-stage attack where the user is prompted to decrypt an archive, further indicating a malicious intent to bypass security controls.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/pify?keyword=bearer+authentication+format
    • http://golop.mannahomesne.com/uploads/1/3/2/8/132814930/f0eaba6.pdf
    • http://files.becomingyoursunsign.com/uploads/1/3/1/0/131070011/d7909db35408f.pdf
    • http://files.pierrevanschalkwyk.art/uploads/1/3/1/3/131383826/fixaf.pdf
    • http://files.justisville.com/uploads/1/3/2/6/132682471/vekamutubev.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/vipamubaminonugezodere.pdf
    • https://cdn.shopify.com/s/files/1/0436/2102/3904/files/50530916692.pdf
    • https://cdn.shopify.com/s/files/1/0450/4797/1990/files/michael_madana_kamarajan.pdf
    • https://cdn.shopify.com/s/files/1/0432/6401/6539/files/financial_enterprise_risk_management.pdf
    • https://cdn.shopify.com/s/files/1/0452/1800/5143/files/wufevunozo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/b_forman_park_pultneyville.pdf
    • https://cdn.shopify.com/s/files/1/0429/2621/1238/files/guzatapasuzotibamafupina.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/jotun_barrier_80_technical_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/17601270676.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_off000066cf.bin
576689f78764bb81617b1a05bc3c9a3978827184f15b26c2bfa93ca978424dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CF 4960 bytes
font_01_sfnt_off00007780.bin
17a1c4a0a77def2b4dbbf73f7b4259038293f8adcc736e5169113c214eef0415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7780 15520 bytes

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