Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5e6a25461e5159…

MALICIOUS

PDF

46.0 KB Created: 2020-08-31 17:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71d9291c7aa9c427bb673fe1e769d11f SHA-1: 857e2cbaed63d8098f3ae463ad6a442312a8659d SHA-256: 0b5e6a25461e51595bd135b1c18e8cfc7c4faf5a96a7ad083b4c6a066e131203
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated but contains a URL that appears to be part of the redirection chain. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=blanket+kick+bts+matikiri
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_82607e4ba07444f7a8f37e09c6aad2ac.pdf
    • https://static.usrfiles.com/ugd/8d57bd_ea284677568c4f5d98cf7e244f099a48.pdf
    • https://static.usrfiles.com/ugd/4117a9_04b91482f2424737961efb630616f719.pdf
    • https://static.usrfiles.com/ugd/a467d2_09cb1deb39f64667952eb955882fd9b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f7deda28ff6422481ffdd6e65b38894.pdf
    • https://static.usrfiles.com/ugd/41a0b6_1fc38387ea624297b9e5a274ac0de5e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e013ddffe1141b6ae4e7d874a777881.pdf
    • https://static.usrfiles.com/ugd/516574_4ef8448f40634a388a2b8c9074fbb294.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/mcdougal_littell_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0427/8019/7031/files/76385156707.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4711/files/xefijaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/debeko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000603f.bin
ece35b3eaf0a6aa3e481ff6f83691d0460c9f883075fb34f6aa946b44c30db4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x603F 3088 bytes
font_01_sfnt_off00006b5e.bin
1abe95e6f78d0615d028850717e979849bb7b379c02258da88d6b71da55c1b49
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5E 5200 bytes
font_02_sfnt_off00007cf5.bin
7773e948d871586d5f98ae94681a0ea70c45398e493642d5062c0dfdb365b12f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF5 14916 bytes