Malicious PDF — malware analysis report

Static analysis result for SHA-256 b771dc1519d3d260…

MALICIOUS

PDF

168.5 KB Created: 2020-09-18 04:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cae206ee4394c52254d9958bd3204f64 SHA-1: 8438abfe716f997680db8c165336d99208474ef2 SHA-256: b771dc1519d3d26010c98a65d6bb014fe312b235336806c234b92d8dc88ad032
92 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a malicious redirector link to 'https://ttraff.cc/wb?keyword=confucianism%205%20key%20relationships'. The ML classifier also flagged this PDF with a high probability of maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to lure the user to this external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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.cc/wb?keyword=confucianism%205%20key%20relationships
    • https://cdn.shopify.com/s/files/1/0432/8567/6192/files/dutusavujuwase.pdf
    • https://cdn.shopify.com/s/files/1/0428/1987/9068/files/ratefazumo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0071/5674/files/gejokitaxug.pdf
    • https://cdn.shopify.com/s/files/1/0434/7514/0761/files/identity_theft_report_uk.pdf
    • https://cdn.shopify.com/s/files/1/0440/6214/6710/files/kolefox.pdf
    • https://215e31a2-ea57-4605-a5c1-4fb2295f16b4.filesusr.com/ugd/70e7d4_5de5e62e15374493837b4a76b0b6efe2.pdf?index=true
    • https://ab560fa0-706f-45d4-8cb6-d4602ec9aba1.filesusr.com/ugd/e4ff69_17ed64faa3874ac59189b5bbfc2f3e14.pdf?index=true
    • https://3a28d287-3ef8-4ec1-b820-e9f075e31f4e.filesusr.com/ugd/ce4b7c_932a46b12f4e414ba9158371061d4708.pdf?index=true
    • https://104a5bc9-7986-455e-860d-7c8e0b3b4b62.filesusr.com/ugd/a4c1fa_d29b13ecda074e5bbb761a06930ef4a3.pdf?index=true
    • https://8913e728-1da7-4dd1-a507-254395a64010.filesusr.com/ugd/111c46_2f0f37ba75db4f9187f742ab963f8854.pdf?index=true
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017662.bin
8c0b696b911d1f954d53c0e76705a6be17f6f05b6472834eafb9b7c1ad6ee0f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x17662 63612 bytes
font_01_sfnt_off00023506.bin
ad60b0a75674e40c19fbce5b488ee12b34a11ab42f1492b46c33dbd65fbea048
pdf-font-stream PDF embedded font (sfnt) at offset 0x23506 5448 bytes
font_02_sfnt_off00024772.bin
7669b2132d6c9fdbf0289b5db104b49c021c58bd8df48160c6db371c7a9d14dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x24772 13092 bytes
font_03_sfnt_off0002707e.bin
82e1514807a37c3b587bb73fb8d9d7215a0a298cfcfaabb96b31a138e2434297
pdf-font-stream PDF embedded font (sfnt) at offset 0x2707E 16168 bytes
font_04_sfnt_off00028589.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x28589 4324 bytes