Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf9c7cb63c41650…

MALICIOUS

PDF

42.9 KB Created: 2020-08-12 03:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f98821236ffbb4807a376278309ea879 SHA-1: fe06d033061b6c407501938f0fe2b1603574b0a7 SHA-256: 4bf9c7cb63c416502f4b4c99c281488495e086dd242abfa88b0d7dd2102a98cc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a deceptive lure related to 'Sacramento zip code map pdf' which is intended to trick users into clicking a link. This link, 'https://ttraff.cc/pify?keyword=sacramento+zip+code+map+pdf', points to a known malicious redirector. The document also hosts a large number of external PDF links, many of which are hosted on Shopify, suggesting a link farm or distribution mechanism for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=sacramento+zip+code+map+pdf
    • http://files.shinesocold.com/uploads/1/3/1/4/131455956/6223240.pdf
    • http://files.shopitiswhatitis.com/uploads/1/3/2/6/132681479/bff9655a65bc.pdf
    • http://files.editmythesis.com.au/uploads/1/3/1/1/131163932/9740290.pdf
    • http://files.vigtools.com/uploads/1/3/0/7/130775840/5667d3a89668e1c.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9605/files/git_pull_overwrite_local.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8968/files/84091310398.pdf
    • https://cdn.shopify.com/s/files/1/0428/9311/5558/files/gowezux.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/13804911313.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/vidakure.pdf
    • https://cdn.shopify.com/s/files/1/0432/1945/2072/files/background_cover_css.pdf
    • https://cdn.shopify.com/s/files/1/0431/5466/9729/files/71905525700.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2264/files/65282649784.pdf
    • https://cdn.shopify.com/s/files/1/0438/3955/3696/files/93322992634.pdf
    • https://cdn.shopify.com/s/files/1/0436/2508/7138/files/cuidados_de_enfermeria_en_pacientes_con_sonda_vesical.pdf
    • https://cdn.shopify.com/s/files/1/0440/1732/0094/files/google_drive_viewer_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0435/0830/1989/files/kiwugabif.pdf
    • https://cdn.shopify.com/s/files/1/0438/3748/9309/files/different_types_of_crime_and_punishment.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_off0000693e.bin
854bfccc6cf1a8925871a5ee95e4e50c80d09dcfef91e7a1163315e6fad7b544		 pdf-font-stream PDF embedded font (sfnt) at offset 0x693E 5244 bytes
font_01_sfnt_off00007afa.bin
ac9984acb896b84078d43ece3d988cfb7a7fcdd96c91d1912f3bf8f6daeb1bc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFA 10404 bytes

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