Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf3d0e8deab568a…

MALICIOUS

PDF

45.6 KB Created: 2020-08-05 10:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3dcb10c5bcd6a1258217bf49dd5fdf10 SHA-1: 658a40eeb367c2b05372924e9d3ff7c6275b7cf0 SHA-256: 5bf3d0e8deab568a32d9a3bb28426239eb51f29306461a355afdbd32a280a77e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links directs users to a known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector.

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=plant+cell+structure+and+their+functions+pdf
    • http://files.bremermountainbaskets.com/uploads/1/3/0/8/130874422/3473407.pdf
    • http://files.cshanice.com/uploads/1/3/1/3/131398095/3a992d0.pdf
    • http://files.obchaymarket.org/uploads/1/3/2/7/132740949/3445403.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/77769376743.pdf
    • https://cdn.shopify.com/s/files/1/0430/9847/2605/files/47899013449.pdf
    • https://cdn.shopify.com/s/files/1/0429/0890/9734/files/95087966613.pdf
    • https://cdn.shopify.com/s/files/1/0440/4995/7029/files/78705741317.pdf
    • https://cdn.shopify.com/s/files/1/0439/0181/2904/files/jetsons_theme_song_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0438/8562/5499/files/vibration_of_cantilever_beam.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/kezaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2329/3864/files/2207815701.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/78831710642.pdf
    • https://cdn.shopify.com/s/files/1/0433/2329/3864/files/statistical_quality_control_rc_gupta_free_download.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007564.bin
204448a90b56b784f0888f8f627116954e00aaf0472ad008fbd7b56cef7b224b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7564 5244 bytes
font_01_sfnt_off00008730.bin
b115159450b727c2b189ba35527dcd7b89547ded9e9539a89847d52540a612d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8730 10076 bytes