Malicious PDF — malware analysis report

Static analysis result for SHA-256 639dad3e66237864…

MALICIOUS

PDF

50.4 KB Created: 2020-08-30 07:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2102335d3f198518d7e7e7e39a0a5d5d SHA-1: 6e3c8421656037668ef7c3f90d22a1047c8513ab SHA-256: 639dad3e66237864b51d391be6373fdaf53592fb7aee7b4f161a28a4df786954
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains a URL that appears to be part of a link farm designed to drive traffic to potentially malicious sites. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is used for malicious redirection.

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.cc/wix?keyword=sam+trang+trinh
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5373/6351/files/shiva_cartoon_video_v-_s_mobi.pdf
    • https://cdn.shopify.com/s/files/1/0452/8803/0370/files/38905127482.pdf
    • https://cdn.shopify.com/s/files/1/0430/6019/9573/files/tibodu.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc9fbe74a5f4431db8ba452051342171.pdf
    • https://static.usrfiles.com/ugd/de3d83_eda644e27d1d4b4a8e1817395ef7dcd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_f624fbbfb4d7446c9c5980f4503ad540.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce1e48244c014206ba6b39bce20c7902.pdf
    • https://static.usrfiles.com/ugd/b7ed05_65caa08b0cbb4bdb8ab49672cdfc5cc9.pdf
    • https://static.usrfiles.com/ugd/12f4eb_30de00ff17a34968aaf5932490a053c6.pdf
    • https://static.usrfiles.com/ugd/ec0c41_762d39711e74410ca4391d33cc63da6a.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0450/files/ziziwitelixebofimuke.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/51244649985.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0823/files/dikis.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7650/files/rufejavuxirowuzirakujase.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_off0000847a.bin
2d5128598c987da20a0610b3179cf7b495e7922a2a10d30b2c18a7586744ea49
pdf-font-stream PDF embedded font (sfnt) at offset 0x847A 4992 bytes
font_01_sfnt_off0000953d.bin
c8542cd020ce4022c0e11e8916e602aabfbd94e728ad484ef6bd8aa795a0a904
pdf-font-stream PDF embedded font (sfnt) at offset 0x953D 12136 bytes