Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de161498b356acb…

MALICIOUS

PDF

80.4 KB Created: 2020-09-02 01:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 134915505770d91944312b1948f0ac26 SHA-1: f7c6d8d8648bdada92cb2bb93fffde4e4206d881 SHA-256: 3de161498b356acb84adda3aad97bf821cb1ef7c246ee856dace9e545ecbbed6
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL, which is likely used to lead the user to a malicious site. No scripts were extracted, limiting further analysis of the payload.

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.com/wix?keyword=more+information+about+taj+mahal+in+english
    • https://cdn.shopify.com/s/files/1/0428/2286/0966/files/wondershareelement_pro_ocr.pdf
    • https://cdn.shopify.com/s/files/1/0437/1945/8967/files/loan_approval_letter.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/10160946534.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/32948107617.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/46535731004.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/83152897540.pdf
    • https://static.usrfiles.com/ugd/7c1f05_66eb2eafab354079aec3d6dee53b8818.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f9d7878fc5d424aa2ad22b1841f14e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa6c7daf8fec4cd58c46d8b9aa7744a8.pdf
    • https://cdn.shopify.com/s/files/1/0429/2889/8211/files/massey_ferguson_135_service_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/stihl_repair_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6100/files/42148451612.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/1524891576.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d55b.bin
bd4f853f27b2565e42f4c315fc03efe31a0e88adc883abb8a93ac8c249d14132
pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 5284 bytes
font_01_sfnt_off0000e729.bin
8b397971a59961c7c32cb5928b1ea71aed2f6528e519835ebbd0c36f0788d20e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 11144 bytes
font_02_sfnt_off00010d19.bin
5c964b3fd2fc3869016f0ad64f47c5894226ebc2eb4be4d28d6257600d78921b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 17044 bytes
font_03_sfnt_off000125bb.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 4324 bytes