Malicious PDF — malware analysis report

Static analysis result for SHA-256 402d5e01b4f52ad1…

MALICIOUS

PDF

41.6 KB Created: 2020-08-28 15:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07f7f53d669c0a7cf812bacb6c8995a8 SHA-1: 661451edf89ce9afb19c854155dc174fa2af7490 SHA-256: 402d5e01b4f52ad1f7318ed310cd939dcacd3de0017116a23caf8b11fbce9751
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The presence of numerous other links, many pointing to Shopify-hosted PDFs, indicates a link farm strategy, likely to improve search engine ranking for malicious content or to obscure the true destination. The ML classifier strongly supports the malicious nature of this PDF.

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=%25C4%2591i%25E1%25BB%2587n+l%25C6%25B0%25E1%25BB%259Bi+220v+bao+nhi%25C3%25AAu+ampe
    • http://files.katrinalemons.com/uploads/1/3/1/6/131636789/5510670.pdf
    • http://fatesaf.tinwagonboutique.com/uploads/1/3/0/8/130814328/lukezumoxotixubujek.pdf
    • https://cdn.shopify.com/s/files/1/0437/2702/8375/files/qu_significa_adorar.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/72184286896.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/15024142474.pdf
    • https://cdn.shopify.com/s/files/1/0435/1875/4971/files/vidataninebaleguvobununat.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/south_africa_travel_guide_map.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/free_808_sample_pack.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/ek_bhole_ka_bhagat_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/1312/7835/files/57777718730.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5888/files/jajupa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2890/5127/files/moroduvekatujazunet.pdf
    • https://cdn.shopify.com/s/files/1/0443/1344/4508/files/naniv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2871/files/epinephrine_davis_plus.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_off00006017.bin
633e454a5a1e845d727b6948f9f4d5dbf0f924fa55a3ff5ab8f32c64e31d2995
pdf-font-stream PDF embedded font (sfnt) at offset 0x6017 5896 bytes
font_01_sfnt_off00007338.bin
cdc3b3587c324814f3f171816346ba50a1b7ca2d116fb353725ae9d0690ed07d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7338 10744 bytes