Malicious PDF — malware analysis report

Static analysis result for SHA-256 5308ecb9d4b24e0d…

MALICIOUS

PDF

46.9 KB Created: 2020-09-10 08:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fb14949157593e1a6ba81989e73ef2d SHA-1: 32a33473cdf423d9719b606c4c68fa9a4ee4720c SHA-256: 5308ecb9d4b24e0dcceaa2de9ee67dbe381785fa48a5acda14d90da2ef2cc93d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of these links, https://ttraff.link/wix?keyword=irregular+polygon+worksheets+for+3rd+grade, is identified as a malicious redirector. The document's content appears to be a lure, using educational keywords to entice users to click the malicious link. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=irregular+polygon+worksheets+for+3rd+grade
    • https://static.usrfiles.com/ugd/828753_43e3348df7c64e0ca1f03bb2d5b1638e.pdf
    • https://static.usrfiles.com/ugd/6812d7_b50253a219bb4035b5a68553fe03f6a2.pdf
    • https://static.usrfiles.com/ugd/7820d0_65d5efc6b8214684bcf4a84647679103.pdf
    • https://static.usrfiles.com/ugd/d5cf39_b3da30cdff9a4b51a52a8d198e706367.pdf
    • https://static.usrfiles.com/ugd/6e3131_1e4682a265a0418e8f9ed99115f35408.pdf
    • https://static.usrfiles.com/ugd/0bfb20_5e9b0833bd454166aef042b23ac3ea11.pdf
    • https://static.usrfiles.com/ugd/7921d2_85119425eef8404f93b7d51c9c71e003.pdf
    • https://static.usrfiles.com/ugd/d902bb_e643301a60034115893a40fc11753706.pdf
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/sheet_metal_forming_process_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0430/7487/9641/files/37392315460.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/kurorutobabelufurozunud.pdf
    • https://static.usrfiles.com/ugd/8bf3fc_87cf81cdedf24d44901eb456b3f6082e.pdf
    • https://static.usrfiles.com/ugd/4a6c57_dad510f8b2864716b9444ac8ea6bed35.pdf
    • https://static.usrfiles.com/ugd/55cc32_d72a8969225d4cc4a9fba12496871b13.pdf
    • https://static.usrfiles.com/ugd/d6b5da_001c7afff2f94454a7012a298326db77.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_off000054b4.bin
434c2e16964ca6dc6eecb078a14f66aa98f25b3624832d20f71d90546da6181c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54B4 5496 bytes
font_01_sfnt_off00006771.bin
f5849d83ee11fdd3df8f0264b6fcb51acc2d6c43b83906a8a4d942f76cf9fbfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6771 9900 bytes
font_02_sfnt_off0000894f.bin
586fd2d47d7ef655ac8fcedaf3a17ac43b55ee34544d24df6525aba8b365c669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894F 16116 bytes
font_03_sfnt_off00009e28.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E28 4324 bytes

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