Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f96a759257f55a…

MALICIOUS

PDF

50.0 KB Created: 2020-08-31 13:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3712d45e2444b7979651fabb249d0e6d SHA-1: 9386fa6d69630284a48c9446a6d6d7979e72474b SHA-256: 65f96a759257f55acdb3b8ad6881a77a685f1937a5b5d752580dd083da6dde59
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a malicious redirector link and a large number of external PDF links, indicating a link farm designed to lure users to potentially malicious content. The primary malicious URL identified is https://ttraff.cc/wix?keyword=askep+bblr+nanda+nic+noc+pdf. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=askep+bblr+nanda+nic+noc+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ac72e0_07870d9f16aa43c68cc1efbb93ade004.pdf
    • https://static.usrfiles.com/ugd/cdb50c_1c50115e26894efe9aa3e8e53361ce5f.pdf
    • https://static.usrfiles.com/ugd/9904c2_688bd173d8274980a96579e97bfb3ef3.pdf
    • https://static.usrfiles.com/ugd/73c254_d29b8c08e09b45e096787f0fa4bb8d42.pdf
    • https://static.usrfiles.com/ugd/fe83c3_ee09f35c0c644338a052b8a3590ffb75.pdf
    • https://static.usrfiles.com/ugd/b4609a_9e17564cbcd34fc8b33f7e021338c13e.pdf
    • https://static.usrfiles.com/ugd/739437_a77d8c54419944c79e29650181f61352.pdf
    • https://cdn.shopify.com/s/files/1/0434/1268/4967/files/black_background_4k_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/tiwuloxetipagobaxofagem.pdf
    • https://static.usrfiles.com/ugd/8e1900_f5cda63b745d4fd9b871be7baca96325.pdf
    • https://static.usrfiles.com/ugd/856cea_f266f80414b84ab482971bf8c9018e76.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086af.bin
d9223205f40b1780122ab5320680f89c95ba7328fef8746a44552223c95fca38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86AF 5344 bytes
font_01_sfnt_off000098e6.bin
a241ad0e8344917ac10c0854826e6e5a8916d0f1518a2ee41c324381d3b1745e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98E6 10208 bytes

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