Malicious PDF — malware analysis report

Static analysis result for SHA-256 8543eb4790fc8cc6…

MALICIOUS

PDF

42.8 KB Created: 2020-08-04 17:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee9fcba0d31e3911b0ce931e66dbf5af SHA-1: 65e5e898e833716ec3024900e730ab740621e646 SHA-256: 8543eb4790fc8cc6161b38c1b20b483582f200ba9cb83f33a158059de06e414c
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=best+core+java+interview+questions+and+answers+pdf. This URL is part of a link farm that includes numerous other URLs hosted on Shopify, likely to obscure the malicious destination. The ML classifier strongly indicated maliciousness.

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=best+core+java+interview+questions+and+answers+pdf
    • http://files.thecorydonexplorer.com/uploads/1/3/2/6/132682471/98083cf54.pdf
    • http://files.neilbushby.com/uploads/1/3/1/3/131379099/3392620.pdf
    • http://zaluv.dreamasweetdream.com/uploads/1/3/2/6/132696194/1923594.pdf
    • http://files.sunventuretours.com/uploads/1/3/1/4/131407135/b46cc.pdf
    • http://files.wildflowerwomen.net/uploads/1/3/0/9/130969080/likok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xiwisabimetabif.pdf
    • https://cdn.shopify.com/s/files/1/0438/1887/7090/files/jigofoxuzef.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/sisitelezapunusod.pdf
    • https://cdn.shopify.com/s/files/1/0440/7571/2664/files/bixotepejaj.pdf
    • https://cdn.shopify.com/s/files/1/0436/9560/3862/files/ligne_11_aix_en_bus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45927795399.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/15723539658.pdf
    • https://cdn.shopify.com/s/files/1/0437/7670/4664/files/kapesizizepagaduwexari.pdf
    • https://cdn.shopify.com/s/files/1/0434/6963/5746/files/58652944998.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_off00006868.bin
318fb0e125385d23d72f119122c5a857ee106553e386023964963e2eaae3a9c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6868 5520 bytes
font_01_sfnt_off00007b59.bin
3b3136b2d76fa30d416a27fda9b5ab05521e7af293258bb1e1378da2bfba7aea
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B59 10124 bytes