Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d991423ace84d6…

MALICIOUS

PDF

49.0 KB Created: 2020-08-26 11:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91cf8f58b8833f4b605a22df8c29ec48 SHA-1: abb424563ba3f596cda274364809f26a5a19343d SHA-256: 18d991423ace84d66920ac1bb2405e44a3c0facba78da4e4ebb271f25c898101
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a redirector link to 'ttraff.com'. This suggests an attempt to lure users to malicious infrastructure. While the document body is heavily obfuscated, the presence of multiple Shopify links and other PDF files indicates a potential link farm or content distribution strategy. The ML classifier strongly supports the malicious nature of this PDF.

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=lanza+del+vasto
    • http://files.marinersguide.info/uploads/1/3/1/4/131414516/75d76.pdf
    • http://bepaj.adskope.ca/uploads/1/3/1/1/131164394/tabozigeto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/2826/2560/files/chemistry_lab_report_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/8298/0259/files/nobotatamis.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/53176850084.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80278007767.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/24956212904.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/deductive_reasoning_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/vetoda.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/74815151716.pdf
    • https://cdn.shopify.com/s/files/1/0472/2425/8725/files/solegasubexokesovenul.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/ejercicios_rima_asonante_y_consonante.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/42226789931.pdf
    • https://cdn.shopify.com/s/files/1/0430/0954/0257/files/60519696114.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_off00008408.bin
55c5ffb684e0f43442560cd4ad161bf5193f1defea4ac1a8c5c1c5926598a106
pdf-font-stream PDF embedded font (sfnt) at offset 0x8408 4776 bytes
font_01_sfnt_off0000946a.bin
73d4b2635330eb102d4d0894949ed7affd49fcfa50932a0c7609e8178c90e163
pdf-font-stream PDF embedded font (sfnt) at offset 0x946A 10296 bytes