Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0a413ca57a4df4…

MALICIOUS

PDF

43.3 KB Created: 2020-08-01 15:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e23347a805410da3700a82a42eaaf506 SHA-1: 134eaecc874b86ab320d991b64ec9dbf244b0675 SHA-256: cb0a413ca57a4df4a721d668f9be61a6bdddd8732efcdb2fff64090df18dd8ca
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on various domains. One of these links redirects to a known malicious URL (ttraff.cc), indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=sys%252F+socket.+h
    • http://files.talyakingston.com/uploads/1/3/0/8/130814209/cef78efb4.pdf
    • http://files.bluedogwood.com/uploads/1/3/1/1/131164425/fadex_wopexepupaxe_vofuwo.pdf
    • http://files.leadsolutionss.com/uploads/1/3/2/8/132815298/b2ccd544aa0cb9.pdf
    • https://cdn.shopify.com/s/files/1/0437/8266/8437/files/wewilolewukuwup.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/dabuwexotevuxidimiwevefed.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/23295142847.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/rimani.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18842325712.pdf
    • https://cdn.shopify.com/s/files/1/0429/5242/5631/files/vizirajej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65496272691.pdf
    • https://cdn.shopify.com/s/files/1/0430/9506/4730/files/39447489076.pdf
    • https://cdn.shopify.com/s/files/1/0437/1608/3877/files/gegozanusatukolizogas.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/tesimowafevebanuni.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4702/files/55658606988.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1827/files/98500913843.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/litenefividonoxolavefaga.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_off00006477.bin
5447dc8e1bfc820f064f89d6872e801d6d945397e03769d019a70cc813cc52f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6477 4884 bytes
font_01_sfnt_off00007533.bin
e4a0d9ace4cdf2c9a3e53c1d72c19065fd986e9f406fa9f295c8a9de2c177255
pdf-font-stream PDF embedded font (sfnt) at offset 0x7533 13752 bytes