Malicious PDF — malware analysis report

Static analysis result for SHA-256 85edfc0bc7222601…

MALICIOUS

PDF

52.0 KB Created: 2020-09-01 02:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d829b2571ae13bae7cca07daea079fc0 SHA-1: f12f1a2cf23d4b1a213679d7d70cc4deb7a18c10 SHA-256: 85edfc0bc7222601b267584bd52831b4c3a69893e8614540313803802dddc13e
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL and a reference to 'wkhtmltopdf', suggesting it was generated programmatically. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many pointing to benign content, likely to mask the malicious redirector. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

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.club/pify?keyword=amla+medicinal+plant+information+in+marathi
    • https://static.usrfiles.com/ugd/4f270c_dfb8aa8484624afc9eff04754ffc5224.pdf
    • https://static.usrfiles.com/ugd/20d83a_7300935cfa4b4c439f329034f0b3c92a.pdf
    • https://static.usrfiles.com/ugd/e8506d_db535b8283f143e484ec9cde95e1c7b3.pdf
    • https://static.usrfiles.com/ugd/1f5cef_cf68cd6ce0e641fab9bfb0ed020f14e9.pdf
    • https://cdn.shopify.com/s/files/1/0432/0880/2468/files/xapipugijip.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8872/files/pubg_boot_camp_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/baroque_architecture_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/0486/2375/files/89443973191.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/xamofiweren.pdf
    • https://cdn.shopify.com/s/files/1/0443/2855/0556/files/27821749230.pdf
    • https://cdn.shopify.com/s/files/1/0431/7554/2950/files/51318392976.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/depelinagusazoboreturizi.pdf
    • https://cdn.shopify.com/s/files/1/0441/1988/3928/files/19868702323.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/81030627987.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/
    • https://static.usrfiles.com/ugd/e8506d_db535b8283f143e484ec9cde95e1c7b

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066fa.bin
42c127cd48dce7fa536eb20a44594e4ed25ceff8685bee42774365152ea1975d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66FA 4992 bytes
font_01_sfnt_off000077b4.bin
89aebe1f0969a546dfd7e4091e67490c3e139dff681a65f7288705e137798baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B4 10168 bytes
font_02_sfnt_off00009a72.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A72 4324 bytes
font_03_sfnt_off0000a872.bin
2bf9a31b60506302fe0ce1805858b9b2f3a14cb2d304c944a053f2feef14b9d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA872 7384 bytes

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