Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fa99c077d233b8…

MALICIOUS

PDF

35.6 KB Created: 2020-08-26 11:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d584b6cb78d156f8bd6c753f0643efe SHA-1: 0fb06e7b967a19daf30594b677666f197548f7bf SHA-256: 65fa99c077d233b84b6c640478a8c386c2303804b27fca3d84ccc0645156615d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users to external content. The presence of numerous links, some to benign Shopify files and others to unknown domains, indicates a link farm or redirection strategy.

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.com/pify?keyword=motorguide+varimax+55ht
    • http://monupaxot.derekdbass.com/uploads/1/3/1/4/131438044/luwimexalawe-nekovubomol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6974/2999/files/womivererexediziguvawarub.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/79509070223.pdf
    • https://cdn.shopify.com/s/files/1/0436/9409/6539/files/catalogue_inax_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/teach_like_a_champion_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/64394836768.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/tipos_de_cilindros_neumaticos.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/bekus.pdf
    • https://cdn.shopify.com/s/files/1/0428/4104/7206/files/powetorezezasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0681/1560/files/wikobexuxotuxotitizad.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/zekibodojumopewerogiwow.pdf
    • https://cdn.shopify.com/s/files/1/0436/0490/2045/files/mozilla_firefox_32_bit_old_version.pdf
    • https://cdn.shopify.com/s/files/1/0428/1185/0918/files/8227649164.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5669/files/rovogumigezududafavoze.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_off0000484c.bin
65d505d740ee7b0d8c1bb45d238b6387a247613a6785d3efa562fb07c150b82b
pdf-font-stream PDF embedded font (sfnt) at offset 0x484C 5284 bytes
font_01_sfnt_off00005a3e.bin
1e72fa7a323cd780b85d979e4d36118b61f79065a695789e5d07cd6ba7e89bda
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3E 12284 bytes