Malicious PDF — malware analysis report

Static analysis result for SHA-256 9252d81d4b8ce85e…

MALICIOUS

PDF

40.6 KB Created: 2020-08-22 14:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db0f16f6d3475b123a006b00ef32b03f SHA-1: 18b3fd5569c92e58bbed2e91dad2b52859d06eb1 SHA-256: 9252d81d4b8ce85edb05663f8077e65a880d4c3cd66607ea14e366a5bc21805e
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, 'https://ttraff.ru/pify?keyword=cdr+format+aplikasi+apa', is identified as a malicious redirector. The document's content appears to be obfuscated or corrupted, but the presence of numerous links and the malicious redirector strongly suggest a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

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=cdr+format+aplikasi+apa
    • http://lupopi.jenlarussa.com/uploads/1/3/1/6/131607305/0b82130.pdf
    • http://files.wednettraining.com/uploads/1/3/2/3/132302924/7928973.pdf
    • http://kufivupek.karoogravelgrinder.com/uploads/1/3/0/7/130738696/buduvixisen.pdf
    • http://files.georgianbaybeauty.com/uploads/1/3/0/7/130775747/tomorefufogexuf.pdf
    • http://files.frostteacher.org/uploads/1/3/1/8/131856347/jigegutazexagi-juzov-pezugewiga.pdf
    • https://cdn.shopify.com/s/files/1/0432/7152/0411/files/2853822400.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/dell_demension_3000_specs.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2838/files/json_lint_formatter_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/photosynthesis_and_chemiosmosis_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/zujulimos.pdf
    • https://cdn.shopify.com/s/files/1/0451/0393/9749/files/business_plan_template_fill_in_the_blanks.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_off00006214.bin
17f9389b06572fafd544299dc9058c7ff95c3c0228ac87f6033e347ee681b1f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6214 5156 bytes
font_01_sfnt_off00007386.bin
35a8a6d732d53c03d6dba1421cee1fead040d53c602fefbb27a004b027df7b09
pdf-font-stream PDF embedded font (sfnt) at offset 0x7386 10052 bytes