Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfb4f5c0c79853b…

MALICIOUS

PDF

41.7 KB Created: 2020-08-21 15:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd0e28e2ca729299e3f568bef09767d2 SHA-1: 7686900d23cc1367fcd3af333203e4f9568de882 SHA-256: 7cfb4f5c0c79853bd684cd4bc462ee4e705c2d41a27ab0d5afcb5f3a1fdbaea5
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Emergency contact card for wallet template' and the malicious URL, suggesting a lure to trick users into visiting the redirector. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=emergency+contact+card+for+wallet+template
    • http://files.summasportswear.com/uploads/1/3/1/4/131453807/118d8e22a22790b.pdf
    • http://files.photobookmarks.net/uploads/1/3/1/8/131856456/3c3a4f12.pdf
    • http://files.frederickdeknatel.com/uploads/1/3/2/6/132695454/6605806.pdf
    • http://files.photobytrish.com/uploads/1/3/0/7/130739312/7284708.pdf
    • http://dofajut.mattmonfettlaxcamp.com/uploads/1/3/2/6/132696067/2390608.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/bugelor.pdf
    • https://cdn.shopify.com/s/files/1/0431/4343/0305/files/mesin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/merge_all_sheets_excel_vba.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/54975525922.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/how_do_you_reset_origin.pdf
    • https://cdn.shopify.com/s/files/1/0428/2620/3302/files/pewiwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/futazagep.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/algebra_2_solving_equations.pdf
    • https://cdn.shopify.com/s/files/1/0430/3673/7699/files/stanford_roommate_essay.pdf
    • https://cdn.shopify.com/s/files/1/0437/8440/5153/files/rig_veda_samhita_in_sanskrit.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_off000062f3.bin
1ab9e5437ac2968240bd6b165e44da3515ce8a1532df07d683be8ce9184f9a12
pdf-font-stream PDF embedded font (sfnt) at offset 0x62F3 5448 bytes
font_01_sfnt_off00007573.bin
735b943c52f8fcdc8c80dc3d8f2c4987ffc9ae0547ba8da339d442dddc102b64
pdf-font-stream PDF embedded font (sfnt) at offset 0x7573 10668 bytes