Malicious PDF — malware analysis report

Static analysis result for SHA-256 6058bac25bc3b990…

MALICIOUS

PDF

39.1 KB Created: 2020-08-22 19:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79f7c3ce5fed6544427be915d7d031e0 SHA-1: f42d30d2e01c76fc71511cc9823db9e9f7ee59e3 SHA-256: 6058bac25bc3b990aab33b9bb755b749e8040d4a6536dc8aad8bf7e0698b997b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains references to movie songs and the wkhtmltopdf tool, likely as a lure.

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=naqaab+bengali+movie+all+video+song
    • http://files.phoebesmithceramics.com/uploads/1/3/0/7/130776852/5924525.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8973/1479/files/dixevijipaledediralifuli.pdf
    • https://cdn.shopify.com/s/files/1/0431/1701/9292/files/ahora_j_balvin_song.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/vuxixaritepevab.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/feroliranakuviji.pdf
    • https://cdn.shopify.com/s/files/1/0436/5461/1102/files/25193968716.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/figum.pdf
    • https://cdn.shopify.com/s/files/1/0435/3395/9327/files/sensualidad_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/baxiloxawiveme.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/70834703651.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8182/files/anime_flash_games.pdf
    • https://cdn.shopify.com/s/files/1/0439/3022/2747/files/design_technology_specification_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/5687/4151/files/dadiwonesukubebeje.pdf
    • https://cdn.shopify.com/s/files/1/0437/9761/0657/files/gotasisozixeko.pdf
    • https://cdn.shopify.com/s/files/1/0432/7872/9374/files/49386423073.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_off00005023.bin
c058a410310b4e10588a108809fd8bfbb633fd3dd73915ed8f7874bad3ae8e9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5023 5344 bytes
font_01_sfnt_off00006240.bin
c924020c11507be58a845d6fa9b33f81b781bbd0784c346c90ab2d8224adf76c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6240 14868 bytes