Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc8f3e235fa2b91…

MALICIOUS

PDF

48.3 KB Created: 2020-08-15 22:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da34217f6e961664831154ba797badba SHA-1: 403320ce473330681acdbf921832a14c6ff03e33 SHA-256: ccc8f3e235fa2b919006e01d967cf7ddcb76cb7b22683b4084ef15343e6c86c3
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, includes text suggesting a lure for a free PDF download related to financial markets, which is then linked to a malicious redirector. 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/wb?keyword=finance%20and%20financial%20markets%20keith%20pilbeam%20pdf%20free%20download
    • http://files.duffybookbinders.com/uploads/1/3/1/4/131437676/vugelelok.pdf
    • http://files.cherylynsalon.com/uploads/1/3/1/1/131164479/dofofavasisuzakuxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/important_branches_of_biology.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0999/files/22413384772.pdf
    • https://cdn.shopify.com/s/files/1/0434/3011/7542/files/27303598544.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9362/files/20874561025.pdf
    • https://cdn.shopify.com/s/files/1/0435/0584/4390/files/skyrim_load_order.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9426/files/pearson_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/0482/8580/files/guia_de_medicina_ambulatorial_e_hospitalar_unifesp_pneumologia.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/banefidofekadozimodomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/22146974054.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006501.bin
b4a707bd97310f43be3543bd07738ea7875b66a1bc5598dfcbff8e61b45b445c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6501 5644 bytes
font_01_sfnt_off0000780a.bin
63d5dc3ec60ba77c4261bfb8af27b884f8356b2a1b2fc9fcf3fb86cbdd9e31ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x780A 9920 bytes
font_02_sfnt_off00009a33.bin
a4dfb55050a95653deb243f62d540b936b96f0fe90480f51adf416b5cf4d29c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A33 17332 bytes