Malicious PDF — malware analysis report

Static analysis result for SHA-256 4774d4e363643505…

MALICIOUS

PDF

46.2 KB Created: 2020-09-18 12:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01b3081f3208883ee3d5738db45ce0ca SHA-1: 1fd94afa4294879f00160bfdcfdacc292de70021 SHA-256: 4774d4e3636435050c4f47fb69e1aad92d761f5841f4e6e2ba1e241c757ec7ed
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm, with one critical link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL found in the heuristics, suggesting the primary purpose is to lure users to malicious infrastructure.

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.ru/wix?keyword=cl2+alcl3+mechanism
    • https://524532fd-8532-4273-8489-67bb66cf8465.filesusr.com/ugd/c70c35_34d59c72f38b422d91faf256a46b4776.pdf?index=true
    • https://bc21d623-f50a-451d-9531-370b2b53f6cc.filesusr.com/ugd/ee4a13_e1711500b1c14865ad1bb0ca3a3a20d0.pdf?index=true
    • https://5bcdae8f-ba66-43dc-b691-e17a3372409d.filesusr.com/ugd/a51aec_e9f14d694b43479aaee1b11265a84baf.pdf?index=true
    • https://6d1b5f19-a331-4d63-908e-3f134faace3a.filesusr.com/ugd/eddc50_d720a4814b0a4bbdbd1078ae356c9ed5.pdf?index=true
    • https://b86c153c-b0fd-46e8-a5ce-2494980937bd.filesusr.com/ugd/c57cae_9097213e85844d23918aff75fc31a5bd.pdf?index=true
    • https://bbf10c46-b448-4239-b013-48e0bdb12cb1.filesusr.com/ugd/5befcb_dc894b99c83a470382f71da7df0bffd5.pdf?index=true
    • https://178ed2c0-534a-4962-9331-42e8514c940d.filesusr.com/ugd/b98abb_7611d2ffc8db41699472b8b7e1038939.pdf?index=true
    • https://877bf4fd-b137-4fea-a216-51e12fb3114f.filesusr.com/ugd/9c66ff_2212efc9ccc04425b75c656c92f28f3a.pdf?index=true
    • https://abce3120-9ad9-4d08-9680-0c0da20dbabc.filesusr.com/ugd/f6336d_74a4e517fddb4f0ba9195c691141a825.pdf?index=true
    • https://ac905007-9264-4b88-ad8b-1fd8ed4f549c.filesusr.com/ugd/54fa57_b811bd85754946e3996806f79d98006b.pdf?index=true
    • https://99860ae9-2a0f-469e-9722-4b655a71f8f7.filesusr.com/ugd/38062a_e730ae9558ac47e18abb28ad9803208f.pdf?index=true
    • https://95d51951-f722-4c84-bdc9-3dfaf0d17eec.filesusr.com/ugd/12f4eb_99a5da9a359246c983a29ced936d1481.pdf?index=true
    • https://8111dcb8-f21b-437a-a402-7cbd20cda5ae.filesusr.com/ugd/dbbfd0_f6ebd79c222347aaa473899228dfeaeb.pdf?index=true
    • https://70c3ffc2-0a67-44a5-91e5-995d80d0623c.filesusr.com/ugd/90423f_76cb30052e6d4f6882beff6af166c1b7.pdf?index=true
    • https://480cf537-462d-4e93-ad36-699f23de72c6.filesusr.com/ugd/4bb894_73ccad43daf241cbba076310df693ac0.pdf?index=true
    • https://eab02bc4-8ea5-4575-9d60-104c7d7f50c3.filesusr.com/ugd/510a18_bfe5f7ee87c94f93abb22575734094f0.pdf?index=true
    • 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/
    • https://eab02bc4-8ea5-4575-9d60-104c7d7f50c3.filesusr.com/ugd/510a1

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077f9.bin
1f32f1589820d2ac864b3c2aed6cad7e6a5ad21d6f2eba79830046bea67e241a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F9 5144 bytes
font_01_sfnt_off0000894b.bin
630322a0dfd24265daf1fbb05531aadacc47dcb770842f19cf30fc0da905fcb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894B 10176 bytes

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