Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca25c460d20439a…

MALICIOUS

PDF

40.4 KB Created: 2020-09-18 01:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec629a47460d2faa4afcad0c0531f92a SHA-1: 0925ef022c619e26f43c8f49d7c8f8b064fcaa41 SHA-256: 4ca25c460d20439a5414703ba33557569fcda663e9dcd537cb94fb23e4c72225
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a social engineering attempt to trick users into downloading further content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the target URL and keywords suggesting a lure for a free PDF download.

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.me/wix?keyword=escoffier+le+guide+culinaire+pdf+free
    • https://f15e9bdf-69fb-414f-a0dd-410073474be8.filesusr.com/ugd/08338c_082849f9eaaa4417a15fb820adbe5b83.pdf?index=true
    • https://67e92320-3c95-4220-982b-8a5929e5def1.filesusr.com/ugd/03a576_331743ded95145ed934150dccac0bb68.pdf?index=true
    • https://3a3ca1c3-75e7-4772-bead-f4fd61f7f4ca.filesusr.com/ugd/b14caa_67e6b8e34a3043ddb42c0e39a51209f2.pdf?index=true
    • https://5e4bd1d9-a566-4d2f-a9b4-8b88d5f31c37.filesusr.com/ugd/cd1d52_1a1becd765654964bac5bf6a9cccf238.pdf?index=true
    • https://214833ab-dcdc-42b4-a012-99e5d9ef3de9.filesusr.com/ugd/0010c8_0c3f3f10a7af4d38980ccec1937b7f80.pdf?index=true
    • https://9ba2df33-4611-4cac-97de-bdd0ab56a8f4.filesusr.com/ugd/436160_52112d83d4dc4b42b69e85053c5c1b8d.pdf?index=true
    • https://a2cae662-0c3d-42c1-a584-d2bb2f3d92fa.filesusr.com/ugd/cafc24_8928ec2be5d34eebb0d91717b547be48.pdf?index=true
    • https://fb40370d-db4c-473b-98ed-daaa9eef027c.filesusr.com/ugd/9cb112_1428fae92aec4424b73862d468eba62f.pdf?index=true
    • https://97518281-3aa4-4530-9056-2889690a64bf.filesusr.com/ugd/b13fd1_5c05b28040434cb987eb0cf1e1b2b7ed.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0478/1103/5295/files/59873613045.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.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_off000058eb.bin
1e9a20ac7e0949d5f3d71d9d45dd2b3672047644c7682d2cee421958ca1644c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x58EB 5280 bytes
font_01_sfnt_off00006af4.bin
4c3dd3cc8ce0826e76055a5808710563a52d2a84ed3e514a98c48925c30b71d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF4 12976 bytes