Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fe29399c2693ba…

MALICIOUS

PDF

31.7 KB Created: 2020-09-01 13:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8d3e029ed818ad4ad122d6eec478fc3 SHA-1: 39b5c3c4cf5dc81dd685cfab70376f002f92a5dd SHA-256: c4fe29399c2693ba983e9036384e729f7686d33dd767aa3f20c1e01ab5d76928
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a PDF link farm, with the primary malicious URL being https://ttraff.com/wix?keyword=black%2527+s+law+dictionary+eighth+edition+pdf. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to lure users to a malicious site.

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=black%2527+s+law+dictionary+eighth+edition+pdf
    • https://static.usrfiles.com/ugd/de65f7_fe9a188162a640419130dfce60eb0775.pdf
    • https://static.usrfiles.com/ugd/3e9e83_37b8e860797642e9888aad22dbc6d0b2.pdf
    • https://static.usrfiles.com/ugd/f84671_d1d28406d0854da08adc299f5ca52017.pdf
    • https://static.usrfiles.com/ugd/99965f_1b9875b5b306476fa000d47637ba1b24.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b9369de28884babb502e35e5b2e1cb9.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_14f0d53b2b824172a17d0d3c05f7c278.pdf
    • https://static.usrfiles.com/ugd/7198c1_270ff7c4eea84fadb69e41f04dbea037.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/target_costing_in_management_accounting.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/josilifobale.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_off00003ddc.bin
0ba012ff8bf4381e7b86368a16ac560e3de0e8d9a6ec39d0b069359ab241347c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3DDC 5760 bytes
font_01_sfnt_off00005196.bin
f053577238878eedaa3ebfd5a5df6563cb5858ec8e222ef9661efd958cbed784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5196 9552 bytes

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