Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf14e7ace0eb228…

MALICIOUS

PDF

34.4 KB Created: 2020-08-19 08:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3843b1c8718f51ed45224d96362c98f6 SHA-1: 7a56630eb3f330fb0d0c9660e1c6d690337ae9ed SHA-256: 4cf14e7ace0eb22878ec0125bd84ebc3c5d8a18c1029eba8d973ac59b710624b
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, with one identified as a malicious redirector. The heuristic firings indicate this PDF is part of a link farm, likely designed to manipulate search engine results or lead users to malicious content. The ML classifier strongly supports the malicious nature of this document.

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=manual+piscicultura+embrapa
    • http://lunari.likesgoodbookslifecoaching.com/uploads/1/3/0/7/130775850/6636981.pdf
    • http://files.catrinasluck.com/uploads/1/3/0/8/130814605/2a65fbd5b240.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9957/files/bopudoveraramukevu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/xajijovesafirewoxerez.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/ruxumomanefe.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/cebu_city_street_map.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3851/files/projective_personality_tests.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/tibetamatomekefokulodoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3043/6247/files/wuveli.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/33121582038.pdf
    • https://cdn.shopify.com/s/files/1/0431/4287/3249/files/191_nj_bus_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0440/8341/3142/files/ctet_question_paper_2_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/dog_fucking_girls.pdf
    • https://cdn.shopify.com/s/files/1/0441/1988/3928/files/58724743941.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_off00004880.bin
4d2bafe216320772dd4681fc10ba0e54ee4aa65926afad8b993429fe7b3bbb22
pdf-font-stream PDF embedded font (sfnt) at offset 0x4880 5224 bytes
font_01_sfnt_off00005a23.bin
e04d92a78a7050de441ee2b18f6447e308fe1e0afb4d4b47b5627db9fff6f936
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A23 10228 bytes