Malicious PDF — malware analysis report

Static analysis result for SHA-256 478f83ded58f6273…

MALICIOUS

PDF

37.0 KB Created: 2020-08-17 17:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f22ddf2983a285e0fbe7782331f88c0f SHA-1: d60d0b10bccd618d0186eef8c0c38cb28f91fd7a SHA-256: 478f83ded58f6273331601738c3455615e044172b02dac7efa127695bb5e89b4
152 Risk Score

Malware Insights

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

The PDF contains a link disguised as a size guide, which redirects to a malicious URL. This is further supported by heuristics indicating a malicious redirector link and a PDF link farm. The ML classifier also strongly flagged this PDF as malicious. The primary intent appears to be phishing or leading the user to a malicious site.

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=g+star+t+shirts+size+guide
    • http://files.updateuslanka.com/uploads/1/3/1/6/131637419/wunek.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/susokefunomala.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/gawagixepuvozewux.pdf
    • https://cdn.shopify.com/s/files/1/0432/7247/0686/files/17904700367.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13652925252.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/59375659938.pdf
    • https://cdn.shopify.com/s/files/1/0428/1742/1479/files/11818804656.pdf
    • https://cdn.shopify.com/s/files/1/0429/4869/0076/files/52429327149.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7629/files/best_outdoor_hdtv_antenna_consumer_reports.pdf
    • https://cdn.shopify.com/s/files/1/0445/6172/7647/files/andante_lenguaje_musical.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_off00005092.bin
b09b921ad991d15fd4659a7504d090ab0440087b69a38a1e95b649224f9e9ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5092 5136 bytes
font_01_sfnt_off00006209.bin
6df2ed9e2d2f1cc4f6a1eef5fa8c4be3c07e6cef38c9891c5fe839826262af1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6209 10620 bytes

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