Malicious PDF — malware analysis report

Static analysis result for SHA-256 723ec1ff08c068df…

MALICIOUS

PDF

50.4 KB Created: 2020-08-03 01:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 399f570fefe2da1f7fa29ea39e1e4352 SHA-1: 2ade40486488b59f60e7f2a4168328e35511e080 SHA-256: 723ec1ff08c068df7c0cd2c883363c3b19f20c35bcbbe917ed6dfa8f9ccd80ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector URL. The primary malicious URL identified is https://ttraff.cc/pify?keyword=cmdkey+rdp+ports, which is likely used to direct users to further malicious content. The document body contains obfuscated text and references to 'cmdkey rdp ports', suggesting a lure related to system administration or security. The ML classifier 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/pify?keyword=cmdkey+rdp+ports
    • http://files.bunnaagri.com/uploads/1/3/0/8/130813783/mugenamatoxa.pdf
    • http://files.ascotpaddocks.co.uk/uploads/1/3/1/4/131406826/mofola.pdf
    • http://files.peopleright.net/uploads/1/3/1/8/131858287/b6acc5c9.pdf
    • http://files.mvnatmed.com/uploads/1/3/0/8/130873795/komuruzimanasof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/8883/3701/files/tmux_rename_window.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/bafakaluvapa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0430/3516/4835/files/36732177681.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/feginifikunivamedefofiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/3364/7525/files/26790890348.pdf
    • https://cdn.shopify.com/s/files/1/0431/0669/7367/files/db_password_filetype_env.pdf
    • https://cdn.shopify.com/s/files/1/0438/5685/5190/files/38951232934.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/divusekugolobemafozej.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/31207429952.pdf
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/zabogewozesigi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6273/0645/files/13813852235.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/36794989837.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000672e.bin
affc5ac4e9730f3f9c44d3b03eba9fa0bded6187058825027adca2c116466d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672E 4936 bytes
font_01_sfnt_off000077ea.bin
d587f6d672d5177ba7989e5a90d60dfb0caf4665175990eb7dbac51cbfb3a736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77EA 15064 bytes
font_02_sfnt_off0000a7c2.bin
8305f0426085e1abc5366729f89f3a456acd9f16b7235796d4cf581201bc90e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C2 16220 bytes

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