Malicious PDF — malware analysis report

Static analysis result for SHA-256 84000068221df2ef…

MALICIOUS

PDF

39.9 KB Created: 2020-08-12 05:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ffad5e30dea75c6a1545c18c6376914 SHA-1: 6e468fa694c7c81cb836baa805332d541352917c SHA-256: 84000068221df2ef716a10cb6cfd3e52e8d626dd2247fe5dd26da99ebda97257
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to potentially malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading a rulebook, which aligns with the observed link farm behavior. The primary malicious IOC is the redirector URL.

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/wb?keyword=outbreak%20undead%20core%20rulebook%20pdf%20download
    • http://files.capitolqma.com/uploads/1/3/1/3/131379113/salenewe_mezema_kugofamosuxo_pipinuduvoter.pdf
    • http://files.essenceofbeautydublin.com/uploads/1/3/1/6/131637057/9362341.pdf
    • http://files.quiltwithleslie.com/uploads/1/3/1/3/131398515/luzoguxijuzofa-gevatumuxe-goradenibex-zifasugupur.pdf
    • http://files.statedshowroom.com/uploads/1/3/1/3/131398547/dedido.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7897/files/multilayer_blown_film_extrusion_process.pdf
    • https://cdn.shopify.com/s/files/1/0433/6192/7318/files/6052128510.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/5361032886.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1123/files/41067486450.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/19929355024.pdf
    • https://cdn.shopify.com/s/files/1/0437/8787/8549/files/aprender_a_tocar_guitarra_acustica_muy_completo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9208/files/zalijuzubapokeguw.pdf
    • https://cdn.shopify.com/s/files/1/0440/4579/5493/files/saxaxuramexezibosux.pdf
    • https://cdn.shopify.com/s/files/1/0451/8179/6503/files/siligadir.pdf
    • https://cdn.shopify.com/s/files/1/0435/7763/9075/files/order_of_adjectives_worksheet_for_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0431/4670/7104/files/sobireziduzax.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2068/files/43505342770.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_off00005b4d.bin
a56fc1f0f61013b1dbb1a7602e17ed5897e500f673712976f7f73a140e0ca8a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4D 5296 bytes
font_01_sfnt_off00006d6f.bin
0b3e1df07c65db1f7da3d5d1eddb7022204ea97a30d3fca5d45085bc54c94136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6F 10948 bytes

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