Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f707f53437a658…

MALICIOUS

PDF

41.4 KB Created: 2020-08-29 12:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c49bcd534c2c7167cc7907f9c3525fde SHA-1: 83ab2af387e07191e9f65df13242c2755c82f174 SHA-256: 53f707f53437a658d7211f6fa497f05ee01abfd04164d2d49edfe9972f580690
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a significant number of embedded links pointing to various PDF files, a technique often used for SEO manipulation or to distribute further malicious content. One of the primary links, https://ttraff.ru/wix?keyword=hms+surprise+model+kit+artesania+lat, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the link farm and redirector are sufficient indicators of 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.ru/wix?keyword=hms+surprise+model+kit+artesania+lat
    • https://cdn.shopify.com/s/files/1/0434/9411/3446/files/san_bernardino_coroner_press_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/96222614658.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/lubijisenuwutufiziguxagos.pdf
    • https://cdn.shopify.com/s/files/1/0436/5330/0377/files/vefumori.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0e62dd6c66443f594f71cf643fa641d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b12ea54676b4fd69226921cd694a7aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_e02019584a954817afa1533844b0729b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f83f012773864f15b88dd7246eeb3c87.pdf
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/wojopukigasisimulewoge.pdf
    • https://cdn.shopify.com/s/files/1/0461/9026/4478/files/town_lake_running_trail_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3229/files/73597671633.pdf
    • https://cdn.shopify.com/s/files/1/0431/6374/6465/files/nidefedifodimirugowo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1425/7820/files/galebefexubufelef.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/gol_luigi_garlando.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fa.bin
3c7043f1a06188f52fce0de9cb7a2e11768eb4841dabc45e451c9254ae18dd49
pdf-font-stream PDF embedded font (sfnt) at offset 0x64FA 5132 bytes
font_01_sfnt_off0000764a.bin
aab341d9b370ea113cf1155c205146224342eb28b4ee2e0b65bc9216962ac0f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x764A 10144 bytes