Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce32fbebf9ec3a0a…

MALICIOUS

PDF

47.1 KB Created: 2020-08-30 19:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 263614224bf0a98bb229669c9974664b SHA-1: d1c05e3633ba67098f6959f658cb1ed3ce134df9 SHA-256: ce32fbebf9ec3a0af9b979533ec58704c9768b3c7d79d8d97e36d8fb5e38f41a
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=ap+biology+formula+sheet+2020'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, one of which is 'https://static.usrfiles.com/ugd/3e87bf_f3971f54b1f44fd6b16916d94648c6ad.pdf'. The document body, though heavily obfuscated, contains text related to 'Ap biology formula sheet 2020' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious redirection. 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.com/wix?keyword=ap+biology+formula+sheet+2020
    • https://static.usrfiles.com/ugd/3e87bf_f3971f54b1f44fd6b16916d94648c6ad.pdf
    • https://static.usrfiles.com/ugd/69695d_d2792f8fef094510ae0eff5482e13d7a.pdf
    • https://static.usrfiles.com/ugd/7d21c0_611b4e557c904cc2a35f17ac9d48a9a3.pdf
    • https://static.usrfiles.com/ugd/f55bec_ef83aaef124943379316f5776568d653.pdf
    • https://static.usrfiles.com/ugd/b5aed9_94270a7bdefb42a780fea59b9270a9c2.pdf
    • https://static.usrfiles.com/ugd/e42ee3_6db14ed8cea8478eb620b78181173ef0.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd478a87a217432d8bf1dbebc761b52b.pdf
    • https://static.usrfiles.com/ugd/1f2646_e609760b83df4590b55f2a22c0abae60.pdf
    • https://static.usrfiles.com/ugd/5be868_7521eaaa36344661afa8c1d37395d5f7.pdf
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/95047003186.pdf
    • https://cdn.shopify.com/s/files/1/0437/7870/3521/files/hollander_s_interchange_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2549/7250/files/wafewevuletunige.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8a3b5f26b1c43e3b0c78f03e4a0e224.pdf
    • https://static.usrfiles.com/ugd/be19e1_20a05a7a7ba8460a9346f728b997ad83.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062f6.bin
0a50ee757bf9570a7017b4b03cb051cc44986b5e7908e893d6e8280f3594fe21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F6 5820 bytes
font_01_sfnt_off000076a5.bin
5073805d6952d99dae3566095c9f744c87d2f80d2fa595f4d70d6d599297b8c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A5 10216 bytes
font_02_sfnt_off000099da.bin
70180b97a9b9fe0de1e0c05b06d733d04658c9f7a2923a3eee6842afe753d47e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99DA 16152 bytes

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