Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdda649b0043e70…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 06:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f68083495774b594241c09e163f4cfc SHA-1: 6c109890e78f72d29a380461943f0cf373b4cb4b SHA-256: 7cdda649b0043e7055fa7a9d3288ea88d28b9ac53ed4bfb51830f7e8635b9041
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to appear as a guide for 'Elder Scrolls Oblivion', but it redirects to a malicious URL. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains numerous external links, a common tactic for SEO poisoning and traffic redirection. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=elder+scrolls+oblivion+lockpicking+guide
    • https://static.usrfiles.com/ugd/7a11b0_3a3c528f38e44f4b8925ea2c8879c9ec.pdf
    • https://static.usrfiles.com/ugd/e643da_c7dba22515094fc6a591fc79f406303a.pdf
    • https://static.usrfiles.com/ugd/f0e51d_d30c802d82ec4cf2b0880ceab2169795.pdf
    • https://static.usrfiles.com/ugd/b8c837_da184cc2007d4a55b383342e8a576f75.pdf
    • https://static.usrfiles.com/ugd/cc03df_e7f829c51e9d49cfaf791d3c483a5d11.pdf
    • https://static.usrfiles.com/ugd/b8c837_311dbce3144d43c98b3106dcf7d0116c.pdf
    • https://cdn.shopify.com/s/files/1/0447/4689/9607/files/stewart_calculus_8th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/62603171588.pdf
    • https://cdn.shopify.com/s/files/1/0437/6910/2485/files/nakalu.pdf
    • https://static.usrfiles.com/ugd/81d6a4_bd10f1e3a29a4b7c9d04793b98225397.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_100813a0e0d441b682aae711114edaa8.pdf
    • https://static.usrfiles.com/ugd/b8c837_3788ef4b22f04e26b740a3afc9530709.pdf
    • https://static.usrfiles.com/ugd/299074_9efbb0e3687d4b5fbb5aa96faebf78b1.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_off00006119.bin
50bbc3b7a6454df011190de1a5d57ef8ca1980b2924c1283588c1dac1e19bc2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6119 5252 bytes
font_01_sfnt_off00007310.bin
11e022083d4a7ee4da5d690fb91d01e56135fec96cae14564c931ad8e72d32b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7310 10016 bytes

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