Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ee66470c38c889…

MALICIOUS

PDF

39.9 KB Created: 2020-08-10 19:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1ca5e993e1fba2425006b0601f50034 SHA-1: 6ec87771e95ed96fc7607aca903822629a6f8f10 SHA-256: 13ee66470c38c889c12e4bf969a3eb1fdd3ca2a60113195d5eae7dff84a54ff7
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate content, but the primary link redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains the same lure text and the malicious URL, indicating an attempt to trick users into downloading potentially harmful files. The ML classifier strongly supports the malicious verdict.

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=easy+blues+piano+sheet+music+free+pdf
    • http://files.gatewaychristiancoop.com/uploads/1/3/0/7/130739564/32d28ec1beb.pdf
    • http://files.alanissophia.com/uploads/1/3/1/0/131070450/jorun-wegubexirigeve-limizibepudi-makov.pdf
    • http://kuvomobog.srinagarhotel.net/uploads/1/3/1/3/131379578/8691534.pdf
    • http://files.maristrugby.com.au/uploads/1/3/0/7/130776041/5338555.pdf
    • http://files.oregonsummerclassic.com/uploads/1/3/1/6/131606349/gixoxid-wasad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/23717913111.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/katagabejedubidosowawob.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/types_of_spelling_errors.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3548/files/popusamojojakal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16494210232.pdf
    • https://cdn.shopify.com/s/files/1/0429/5612/8412/files/55805656125.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/trigonometry_and_analytic_geometry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/aircraft_maintenance_technician_handbook_general.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2707/files/wanugokawodaja.pdf
    • https://cdn.shopify.com/s/files/1/0435/8438/9275/files/40975430690.pdf
    • https://cdn.shopify.com/s/files/1/0439/3641/5899/files/dotuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1989/files/xobatiroremomarasupemowom.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/82245539085.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_off000051fd.bin
17ea688878bf2b1bd56d717d0c3595ffa0948f9b7f7382f2cc104a8de6438fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51FD 5596 bytes
font_01_sfnt_off000064d1.bin
4f89eb4669e14d9f68b6bda7dab0b5a0af1409693c0bbb0c6949c522b6397a4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D1 14512 bytes

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