Malicious PDF — malware analysis report

Static analysis result for SHA-256 50711ba107605e1b…

MALICIOUS

PDF

39.6 KB Created: 2020-08-21 08:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f3a1f81c4cf1e33e3a25ae93b656e81 SHA-1: 06cb9ce93fe06547c329b5d371d16ccbe1ad3bdf SHA-256: 50711ba107605e1b64b861e76248fa267a326cb1e425d8a09c99f327cc770ec6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious content. No scripts were extracted, but the ML classifier strongly suggests 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/pify?keyword=credit+note+template+word+doc
    • http://zexiviwib.drummondsmedlegal.com/uploads/1/3/1/3/131384169/vetujaz.pdf
    • http://rawudisux.augustushoffman.com/uploads/1/3/0/8/130814328/kapufu.pdf
    • http://files.brilliantbookclubs.com/uploads/1/3/0/7/130776245/a9fd01.pdf
    • http://files.drivingfordeclan.com/uploads/1/3/1/6/131606733/a5645474.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/rixakadenijedipozurivumer.pdf
    • https://cdn.shopify.com/s/files/1/0434/0996/5212/files/70631805649.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/73311659669.pdf
    • https://cdn.shopify.com/s/files/1/0431/4873/8720/files/dezonukunuwuselajusufin.pdf
    • https://cdn.shopify.com/s/files/1/0460/1351/3889/files/kodufabetitunowe.pdf
    • https://cdn.shopify.com/s/files/1/0438/3699/7782/files/d_d_4e_shadowfell.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/jexofitogusonakexolidi.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/primary_school_english_test.pdf
    • https://cdn.shopify.com/s/files/1/0437/4455/9258/files/21774199204.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_off00005dc8.bin
e9ce8d254c194fa867e8f7d162f63e3b0bcf9aeb132d36ebf81f48f9d2a4eef3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC8 5036 bytes
font_01_sfnt_off00006edb.bin
60d857897d23efe335c4648109c64b5a3fda2055455eb822a5f44d63a5668457
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDB 10340 bytes