Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60db72259cd0e69…

MALICIOUS

PDF

72.8 KB Created: 2020-08-13 22:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d54505e1f48ce53969a1055f06143731 SHA-1: 2e9a947499d19acb7d1d5f6e8dd8b4654bc50c6f SHA-256: a60db72259cd0e694de26b9b6f912e4b62adeb367e6b1b4c6d2c8ce033bd32af
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to a malicious site. 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.com/pify?keyword=bed+sheet+shop+in+bangkok
    • http://files.madimikay.com/uploads/1/3/0/9/130969791/dusifeketaluvep-wuraf-rerediz.pdf
    • http://pepisuzu.mriserhoff.com/uploads/1/3/1/1/131164250/4431275.pdf
    • http://files.ltlfitness.net/uploads/1/3/0/7/130775735/0910086e.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4214/files/15990742949.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/jedofadasakop.pdf
    • https://cdn.shopify.com/s/files/1/0436/7027/4201/files/60703115762.pdf
    • https://cdn.shopify.com/s/files/1/0438/7074/8827/files/55899654088.pdf
    • https://cdn.shopify.com/s/files/1/0439/9667/6254/files/a_first_book_of_ansi_c_fourth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/7020/1760/files/longman_reader_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/3504/9640/files/64895620158.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/pdf_file_merger_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/xopujosuwumaxirowakab.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/44327434913.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_off0000e1b6.bin
05660ce167df08e604d3aff11e551b007c48e2455b5024269a4d5c3e376f72a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 5348 bytes
font_01_sfnt_off0000f3e0.bin
090931c13909f1805292694e5133b30817913e5dfb1c22bcc791b9d31625ff33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 10028 bytes

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