Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7483b9120b48ae9…

MALICIOUS

PDF

45.6 KB Created: 2020-08-31 09:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 350a90ce4914d0e870b985628a843f0c SHA-1: 20a98de15a317080d4ef555bd3f894703f90ae0d SHA-256: e7483b9120b48ae9f7340a5ba79291499c7d7db6b8c5f7a665ad18e782584b59
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, many of which point to a redirector URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.cc/wix?keyword=controle+de+math+4eme as malicious. The PDF_SEO_LINK_FARM heuristic indicates a link farm designed to manipulate search engine results, likely to obscure the malicious redirector. 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.cc/wix?keyword=controle+de+math+4eme
    • https://static.usrfiles.com/ugd/60933b_49c7fa51ef7241649c17fa1ec6d7c7e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2f640f340c6440aaa326855df987f29.pdf
    • https://static.usrfiles.com/ugd/b8c837_514fcb85c753499db8ea586f9985d5a2.pdf
    • https://static.usrfiles.com/ugd/2c8d66_e38b1d27f3204137bf6dd0399db794c8.pdf
    • https://static.usrfiles.com/ugd/930050_37981f332d5749efaac7a8574eaa7c39.pdf
    • https://static.usrfiles.com/ugd/e3ff21_a81f8143e2fe47cd971fc5e77ad64368.pdf
    • https://static.usrfiles.com/ugd/21e6f2_bc097fc2345147b9bac80d49b3f9c442.pdf
    • https://static.usrfiles.com/ugd/1decf9_046390aa91e14860897ee06b55b262f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d01c966a0c143d886debc6ec7c5fe9d.pdf
    • https://static.usrfiles.com/ugd/db1da1_6d6f110ed455438fa66918f6d2c65d53.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_424dedbb564744d9924988ecc356282e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5689eced90bd429ca9020d6800e11d52.pdf
    • https://static.usrfiles.com/ugd/7dd30d_f3ffcfebfab746e5b565e3607b6323c8.pdf
    • https://static.usrfiles.com/ugd/73c254_d0ee4a4db0d44f8195b3d8465d624022.pdf
    • https://static.usrfiles.com/ugd/efb3f0_6cf90583e98a461e9ea84bb9c4319ecd.pdf
    • https://static.usrfiles.com/ugd/b8c837_28e3e3daad48408fa536b1a636621400.pdf
    • https://static.usrfiles.com/ugd/f4de5e_ef9764a471534787a48b54f986761789.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000600e.bin
08e0210d756995082358da1594971af6c9bc13dba4a065ed3bf743c82052fa16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600E 4880 bytes
font_01_sfnt_off00007073.bin
54c36549d72708ad9952431c451d976c702d30994f43fcddd0a2f3be3e79e845		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7073 10508 bytes
font_02_sfnt_off0000945b.bin
4a3d97cb0f01b67db0f2c0c67b38c82a67e4beafd846d3a18a1ca53b20acedf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x945B 16100 bytes

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