Malicious PDF — malware analysis report

Static analysis result for SHA-256 72bf4c72e5312ef0…

MALICIOUS

PDF

35.0 KB Created: 2020-08-10 05:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 317b638ef0f2a0da5e6c322259f5cb05 SHA-1: b5cd84ac03e69f9289a2875857cbc50c6fa51e08 SHA-256: 72bf4c72e5312ef002452b341f9d6ebf0e0c38c9a73252c7be21caa55faa7789
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure related to 'advance directive form florida pdf' and embeds a link to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body itself contains the malicious URL and numerous other PDF links, suggesting a link farm or redirection tactic to distribute further payloads.

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.com/pify?keyword=advance+directive+form+florida+pdf
    • http://files.huyettm.net/uploads/1/3/1/8/131872198/divezafavime.pdf
    • http://tojowof.manzanitaspreschool.org/uploads/1/3/1/6/131637136/falesamux.pdf
    • http://files.moonmeart.com/uploads/1/3/1/4/131406960/basomavezawaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1826/3464/files/welumuvewovik.pdf
    • https://cdn.shopify.com/s/files/1/0429/2342/5955/files/80875610732.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/resofilomuxarerul.pdf
    • https://cdn.shopify.com/s/files/1/0431/7878/6965/files/titixabik.pdf
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/sovif.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/89911184302.pdf
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/zakipini.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/natefi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/kilaxopanunuru.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/zabebomujefexitosam.pdf
    • https://cdn.shopify.com/s/files/1/0431/1043/2929/files/zar_jh_biostatistical_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/80253149037.pdf
    • https://cdn.shopify.com/s/files/1/0446/6756/8291/files/aqa_sociology_a_level.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_off00004ccc.bin
dd97d504daa4e4835eeabeea82cb95844cc1ff6bf33b591de7a70c2fae24d150
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CCC 5172 bytes
font_01_sfnt_off00005e55.bin
1ca58f4809164f7dfde583e5f858296edc0a100a3c99e5390cbba9a5806afae9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E55 9584 bytes