Malicious PDF — malware analysis report

Static analysis result for SHA-256 1868f227ecf8f33d…

MALICIOUS

PDF

43.9 KB Created: 2020-08-11 08:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69d71a1237846f2487f1183d78a752fa SHA-1: 32c7f3e35bdf3fe496127a2d302db6ece43fb611 SHA-256: 1868f227ecf8f33dbc5a998a39abf2d07371509583eea4304ac8df2e7f3e71a7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. This indicates a likely attempt to distribute malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector URL further supports this assessment. No scripts were extracted, but the primary function appears to be acting as a link farm to direct users to malicious sites.

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=aurora+rising+pdf+espa%25C3%25B1ol
    • http://files.leadsolutionss.com/uploads/1/3/2/8/132815298/b2ccd544aa0cb9.pdf
    • http://files.sweetchildofminephoto.com/uploads/1/3/1/4/131483053/xalola.pdf
    • http://files.alexklein.net/uploads/1/3/0/8/130814124/2ab26759e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/66823291627.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/56571790974.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/24069504263.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/john_deere_260_skid_steer.pdf
    • https://cdn.shopify.com/s/files/1/0428/5700/5215/files/senipulilam.pdf
    • https://cdn.shopify.com/s/files/1/0434/2638/1975/files/blue_text_discord.pdf
    • https://cdn.shopify.com/s/files/1/0429/0212/6751/files/24980436077.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6119/files/25412773862.pdf
    • https://cdn.shopify.com/s/files/1/0438/9309/6600/files/kaginogagefoda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/46143793457.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5476/files/borizojerako.pdf
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/44403335477.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_off00006a80.bin
af59f4948b8c618b02663417c1fb89eeff70cad608e72958f5144be6f4e3950a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A80 5408 bytes
font_01_sfnt_off00007cb6.bin
10bb368f826fe6c60326a0fb29bee122c88d73045c9949c17f10d810a674685a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB6 10596 bytes

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