Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adbe810105785d5…

MALICIOUS

PDF

35.3 KB Created: 2020-08-12 07:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dded77fcaafa6bfc38d7b9db0dc24d6e SHA-1: e2bfaaca28ec88238afb50758e826c95ff8e8fa8 SHA-256: 4adbe810105785d56b89139a273939194445c20b917e67126fd010aa2e8104e0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.com. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains the malicious URL, suggesting the primary intent is to redirect the user to malicious infrastructure.

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/wb?keyword=conflict%20of%20laws%202%20noun%20pdf
    • http://files.doitforthemems.com/uploads/1/3/0/7/130775868/kadanuzepab-rulewopaxewi.pdf
    • http://files.purelysimplelife.com/uploads/1/3/1/4/131437531/damilewavulabilaxuju.pdf
    • http://gomuduges.haverhillelite.com/uploads/1/3/1/8/131856177/wuwinewuzuwote_fuxunageba_zuzezixarege_fisukakuzip.pdf
    • https://cdn.shopify.com/s/files/1/0432/0811/4340/files/33935928993.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4504/files/descargar_diccionario_biblico_hebreo_espaol_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2508/files/vonakumipuwuwelasen.pdf
    • https://cdn.shopify.com/s/files/1/0431/1678/9927/files/87032623381.pdf
    • https://cdn.shopify.com/s/files/1/0434/5289/1297/files/worksheets_for_4_year_olds.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/zaralesepumavolipu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5644/files/lejogoriwugulomi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8172/files/80470572170.pdf
    • https://cdn.shopify.com/s/files/1/0450/8889/9224/files/random_case_generator.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0439/4716/3806/files/english_brushup.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/vofidawod.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_off00004b58.bin
a6b1db76c64fa9e4e4243768ec8ffe2a32066277ef031bc0fcc6ffdc8a5c4ff0
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B58 5184 bytes
font_01_sfnt_off00005d1f.bin
0b7220f42d33dfa7f8a6e45930b3deb65e0f4b67ab668581b1797a11b58f4688
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1F 10336 bytes