Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e65636827a74c56…

MALICIOUS

PDF

53.7 KB Created: 2020-09-05 20:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b277076ba4e5abafe5fdcf1f71851a SHA-1: 80517ac8e50e4748cce4f0d8fa6f226e5e45bfcc SHA-256: 9e65636827a74c560fb812576e37070477c48f821d0244f92d3d4772d561e433
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common technique for delivering malicious payloads. The document body, though heavily garbled, contains text that appears to be a lure for 'Android studio shortcuts list for mac'. The PDF also contains a mass external PDF link farm, suggesting a SEO poisoning or link farm attack. The ML classifier 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.link/wix?keyword=android+studio+shortcuts+list+for+mac
    • https://static.usrfiles.com/ugd/575fb0_ef4dc0ce23ce43f68a9d9bdd654a1bbc.pdf
    • https://static.usrfiles.com/ugd/db1da1_3c4b77a0363a45f5b79a37b493e265d5.pdf
    • https://static.usrfiles.com/ugd/738632_a28c5012184e46268e033ad6cf6d4887.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c8ef90836e44f9cbfe21057f7cca750.pdf
    • https://static.usrfiles.com/ugd/3be3a7_74b3f3d863c34db881d870eaabff7463.pdf
    • https://static.usrfiles.com/ugd/314c35_38778bc76aa243798286b2276c0c7e19.pdf
    • https://static.usrfiles.com/ugd/d94ae5_ff50415320c741b8b753faa8ba093260.pdf
    • https://static.usrfiles.com/ugd/b463f2_a82085f769544126aa812030d2e81d63.pdf
    • https://static.usrfiles.com/ugd/36f25b_0c70c8dcd2c14eaeb3408a46a2502d4d.pdf
    • https://static.usrfiles.com/ugd/ce4b7c_e53b4d30fc7740a4adbea3fcf0d3252c.pdf
    • https://static.usrfiles.com/ugd/866690_c627c49cf99e4aa3b7bb9509955a2fda.pdf
    • https://static.usrfiles.com/ugd/ccb1c6_f47b5fc89e954c4fb12d0b9a5308d63b.pdf
    • https://static.usrfiles.com/ugd/c81504_71138d5f9ee2476cae508b3ecd6e7e0f.pdf
    • https://static.usrfiles.com/ugd/73cb9e_81ad9b9f7490416997cfdcd28658712a.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bb1240c36df4070a09f433bd2f94fb8.pdf
    • https://static.usrfiles.com/ugd/26481d_a950de58950a4972b1cd943f428aa367.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066c1.bin
18630ce35ff168bdbd902aee506b41b12e52d224dfdf7708d428e72d6e7b750b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C1 5248 bytes
font_01_sfnt_off0000786b.bin
05aeac9f98ab8f107dc4ecf44800be2ab23a7c574d0997e3dacf1267a5ac41e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786B 6856 bytes
font_02_sfnt_off00008fca.bin
3309eca5ba4f0bd956017e02166f215c673d5dfa51448d701b1439f72a61ed38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCA 10412 bytes
font_03_sfnt_off0000b39e.bin
cb8b0c3b75634a3ac40028f3142d2b99dbff9c8bfe93654f62892c2eba89f065		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB39E 16336 bytes

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