Malicious PDF — malware analysis report

Static analysis result for SHA-256 1531a544c9ba38dc…

MALICIOUS

PDF

37.9 KB Created: 2020-08-19 13:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc8951daf6e2d4a1caa25202c32a5a0c SHA-1: 768fa4324eb8e07c803ee69ae31240c40269d6b2 SHA-256: 1531a544c9ba38dc19e6cdcd7fb0b983b563e4fb83626ee7168e648f27b609dd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm. One prominent link directs to a known malicious redirector, suggesting an attempt to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=cursive+writing+alphabet+template
    • http://laguvodit.ignaciocarballo.com/uploads/1/3/1/6/131606289/c13b5d4c.pdf
    • http://files.wilbanksreptiles.com/uploads/1/3/0/7/130776073/73091842d8ced.pdf
    • http://files.lizstory.com/uploads/1/3/1/4/131453395/7688503.pdf
    • http://files.rachelsarasafer.com/uploads/1/3/0/9/130969241/lekadex.pdf
    • http://files.assistancedogs4all.org/uploads/1/3/0/7/130738681/zimuxe_demulawezi_notebumigezodi_waposapus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6225/3982/files/somadojarixikijajomeritu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3582/0185/files/adeept_ultimate_starter_kit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8037/files/38725314201.pdf
    • https://cdn.shopify.com/s/files/1/0434/8130/1158/files/formulaire_certificat_de_cession_de_vhicule.pdf
    • https://cdn.shopify.com/s/files/1/0448/2210/2178/files/problem_based_learning_steps.pdf
    • https://cdn.shopify.com/s/files/1/0438/2277/6477/files/xukefabiguroko.pdf
    • https://cdn.shopify.com/s/files/1/0435/8415/9903/files/canon_mf210_driver.pdf
    • https://cdn.shopify.com/s/files/1/0432/8292/3676/files/61898694644.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/86902714371.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/ergonomics_furniture_design.pdf
    • https://cdn.shopify.com/s/files/1/0438/3332/7776/files/saxoxanaduvelutava.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_off000055dd.bin
7e3cd654978f004f26aadd5eaebf2280b961adcc9a74e56246ef927ed3761d3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x55DD 5432 bytes
font_01_sfnt_off0000683b.bin
91ad5197f21ec79767ac9a0108e6ca9d53ea22b0969f76d9455763e48f7f9e90
pdf-font-stream PDF embedded font (sfnt) at offset 0x683B 10080 bytes