Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5979a1fe9b1634…

MALICIOUS

PDF

40.2 KB Created: 2020-09-07 03:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d48a28dc0ce71eb5d224f7466d79c869 SHA-1: f405a21cffce195dda334b3ec0be5c19410a999b SHA-256: af5979a1fe9b16342a17194ebdcbe23ed5bcd3abf847d523ff50c1a7d10f2bfc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate this is a link farm designed to direct users to potentially harmful content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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=brevet+2019+fran%25C3%25A7ais+pdf
    • https://static.usrfiles.com/ugd/5360f8_512ebd11562c4a4f83b3d4603fa4e988.pdf
    • https://static.usrfiles.com/ugd/6f53d7_ce76d20864834155a63c260d95e14ccc.pdf
    • https://static.usrfiles.com/ugd/585b1d_08c4ea28ba4644b79adee3af420a6fe7.pdf
    • https://static.usrfiles.com/ugd/c20ea7_ef974409c2734450acdd501ec2d1d794.pdf
    • https://static.usrfiles.com/ugd/2486b5_0c007d89070947ab9c099c91c6390b37.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_6f592189af804b97a2b2393d566d8607.pdf
    • https://static.usrfiles.com/ugd/7c3584_dde3d74aea774707afbc28f015eec1df.pdf
    • https://static.usrfiles.com/ugd/269bb8_3abf965b034440198aecaa4f7647da00.pdf
    • https://cdn.shopify.com/s/files/1/0434/7212/6104/files/zaxojumexufofigazimavifef.pdf
    • https://cdn.shopify.com/s/files/1/0433/4013/6601/files/toilet_buying_guide.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_off0000598b.bin
2bf71ab1701d51a525652fa171d5f6ab9b9394a8d0d59cfdc923cd7557106da5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x598B 5776 bytes
font_01_sfnt_off00006d4c.bin
df9f165956d654f2967ac2d121d9d536041a10efd24caa74e3086a2dabdf46ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4C 11928 bytes

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