Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd2cd2591c71220…

MALICIOUS

PDF

40.9 KB Created: 2020-08-10 17:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39b93b9ad4c731062b08146aeb61f207 SHA-1: 40b477b8ad58beb8d322bbcefc481d6e6292287d SHA-256: 3cd2cd2591c7122070ca6300f618204ac001588db583c1a4047e765bf76dcbdf
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=bagian+bagian+bunga+dan+fungsinya+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating the primary intent is to redirect the user to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=bagian+bagian+bunga+dan+fungsinya+pdf
    • http://jatakox.neoes.org/uploads/1/3/2/8/132814930/morejanadejekan.pdf
    • http://files.judimorningstar.com/uploads/1/3/1/8/131856333/tojedulipuba.pdf
    • http://files.erinkschmidt.com/uploads/1/3/1/4/131407164/1133648.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/tipler_physics_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/estadistica_para_negocios_y_economia_anderson_12_edicion_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/tupovunonutipim.pdf
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/pukodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9709/files/8529563810.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/97543529923.pdf
    • https://cdn.shopify.com/s/files/1/0428/7715/7542/files/muralifilaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/drdo_ceptam_8_answer_key_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/24929620581.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/48751455120.pdf
    • https://cdn.shopify.com/s/files/1/0434/1376/6296/files/bakugozoda.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_off00006391.bin
bc7ba5b29e71c5e12f5b0be5c364f01a56ec902ebf21934df9bd5c34caab9c1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6391 5372 bytes
font_01_sfnt_off000075ef.bin
9f0aeff9d13c01221f760ef8c492c5d214982c557970816125c2be403cd698eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x75EF 9604 bytes