Malicious PDF — malware analysis report

Static analysis result for SHA-256 0067341176f8f85b…

MALICIOUS

PDF

48.8 KB Created: 2020-08-30 16:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a857c80156dcafc73f03d344841a11c SHA-1: 6073566bca616f33c0da40d149b3abf57aad6465 SHA-256: 0067341176f8f85b95140d024cc5fa5763391a360da66cf03fc67d1540fe7130
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the URL 'https://ttraff.com/wix?keyword=wouxun+kg-+uv920p', which is likely used to redirect users to a malicious site. The document body contains obfuscated text and embedded URLs, further supporting the malicious intent.

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=wouxun+kg-+uv920p
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/baldur_s_gate_ii_enhanced_edition_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7352/8223/files/xepolo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0593/3730/files/buvobikaliwodijefupinazi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2756/1634/files/99735915719.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/how_to_disable_bixby_android_pie.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/31125292626.pdf
    • https://cdn.shopify.com/s/files/1/0450/3525/8020/files/99854490303.pdf
    • https://static.usrfiles.com/ugd/b8c837_70aacd58c37a44dcb7a9985d0aba8afe.pdf
    • https://static.usrfiles.com/ugd/d78803_b1e3a0c0adb94e7286e4ac3257ea3487.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8ae1cc5048e42cca5aca5c01c483612.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe087dee0ac440b78ff6ddd6c68974aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f2a34d609c6451b88034df86830965c.pdf
    • https://cdn.shopify.com/s/files/1/0433/8135/8759/files/amendments_11_27.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4013/files/bisugi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ffd.bin
47331fce74345e147e6bbe93ca492e2691885344dabf368033bd14f6bfc2d0e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFD 5136 bytes
font_01_sfnt_off000091b9.bin
21d33dce6c9b3b1cca058a3cd2049b2e8bbdecd9939be3ae4fcb6014061cfc5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x91B9 10652 bytes