Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e85e8417883d50…

MALICIOUS

PDF

43.8 KB Created: 2020-08-31 23:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f657d77af5f24667cde9eb72890d584 SHA-1: a0e680ecab8ee788ac749d3cc5c8cf3a36bcb387 SHA-256: 98e85e8417883d5013c717ad1a4c4a9a2590ed2c004d5ec9b49c3c54781dc120
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes the same URL, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent to redirect users.

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=botanical+names+of+plants+and+trees+pdf
    • https://static.usrfiles.com/ugd/7d21c0_b4e13848e8a14c939b10aa29634879be.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5ce2959be1140ceb0e46b680de0cc8e.pdf
    • https://static.usrfiles.com/ugd/191a6d_d18d46d577fd4deb84e0204d99caa4c3.pdf
    • https://static.usrfiles.com/ugd/aef5b7_fbe2f33c26c84a66908cbecf3a2ab3a5.pdf
    • https://static.usrfiles.com/ugd/8cbfce_c40160f6f9a741ddad9d9ed3af2ce5b1.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_18659aad99bf43dfa6088cd5cdafaba5.pdf
    • https://static.usrfiles.com/ugd/e3ff21_09dcb4ea833c40c09449ef6e5eeb6133.pdf
    • https://cdn.shopify.com/s/files/1/0436/0372/2402/files/9307018332.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/fuzufijivoliwesesajabaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/219985417.pdf
    • https://cdn.shopify.com/s/files/1/0465/0988/3550/files/54368489829.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9095/files/backup_android_to_pc_over_wifi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23582012054.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5894/files/ratonevidarasofuxikixi.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_off0000625a.bin
c5c698d32247d5c7c04b03a1814ffa37e9dbf0659914949c65489463951a20a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x625A 5348 bytes
font_01_sfnt_off00007472.bin
38f6f29420f21c42defafede0c1d9492737c5932c1f1d936a5800176d4da9851
pdf-font-stream PDF embedded font (sfnt) at offset 0x7472 14996 bytes