Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8e4a0a90b31df3…

MALICIOUS

PDF

40.9 KB Created: 2020-08-31 19:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e883dad6ce33574f220e71d3785e864 SHA-1: c48a8b56f67fd75ed1d80e9fa34b14b530ae302d SHA-256: 0d8e4a0a90b31df369d25ae26c59c417c55b1fcdfe2608802708c4c0a34c0731
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a URL known for malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=bypass+google+account+samsung+free', suggesting a lure to trick users into visiting a malicious site. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a link-farming or redirection attack pattern.

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.ru/wix?keyword=bypass+google+account+samsung+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ab0441_1dda4e9599344a338b2e61db88b98357.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca7bd45308a040af9b29010b968ec1ce.pdf
    • https://static.usrfiles.com/ugd/289c5e_658cacd3df1f4eeb8968deea5f9ff4a2.pdf
    • https://static.usrfiles.com/ugd/74e905_4424739c804d4b30a94cc3d7f6c33a24.pdf
    • https://static.usrfiles.com/ugd/7603ae_0b9221e2045c4f528412aa9bd1599543.pdf
    • https://cdn.shopify.com/s/files/1/0433/4066/0891/files/62200298193.pdf
    • https://cdn.shopify.com/s/files/1/0439/1154/4987/files/tchaikovsky_crown_of_roses.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0605/files/sebagorazisipuluj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4713/3088/files/paxefipibe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/58681542642.pdf
    • https://cdn.shopify.com/s/files/1/0463/0754/1149/files/windows_spotlight_wallpapers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/60593517099.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2019/files/lic_jeevan_saral_chart.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_off00006154.bin
40681f4f8308477b537c60a62a327b369e89fe5ac6019eccc110cd2eba98a733
pdf-font-stream PDF embedded font (sfnt) at offset 0x6154 5488 bytes
font_01_sfnt_off000073fa.bin
5c447e4d9228f4d82a30d3d5e2e87c067562b3b62874800c527ffb02e91bd848
pdf-font-stream PDF embedded font (sfnt) at offset 0x73FA 10284 bytes