Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed159c567d16a9db…

MALICIOUS

PDF

60.7 KB Created: 2020-09-03 09:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5796e30eede3688df41ec3737e08394 SHA-1: 5f7938cd4d892819febf65e737929a8de98c6ded SHA-256: ed159c567d16a9dba6c008f728d01de56ca16fef4c214a0ad5800f794853689a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link that redirects to malicious infrastructure, disguised with a search engine optimization-related keyword. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the embedded URL strongly indicate a phishing or redirection attempt. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the exact lure.

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.link/wix?keyword=html5++attribute+mdn
    • https://static.usrfiles.com/ugd/b8c837_f0ebfcabce4c4cf0a162a5a8fcf1f344.pdf
    • https://static.usrfiles.com/ugd/ca300b_c965ab9f73714ed780189a5273bfe809.pdf
    • https://static.usrfiles.com/ugd/2b25b5_80c5c6535d7d466383db760b50ae2243.pdf
    • https://static.usrfiles.com/ugd/ecec20_eb96b5ccf7b1405b8536b7749b8de199.pdf
    • https://static.usrfiles.com/ugd/4aae87_a4753355526d45dbbcdf08dd64e34637.pdf
    • https://static.usrfiles.com/ugd/8a9bcc_53ac947beb5d4313bd6b7c3538d858ee.pdf
    • https://static.usrfiles.com/ugd/d775a9_116d6643d86b42888f095f822b22c0b7.pdf
    • https://static.usrfiles.com/ugd/3ed44c_c123341bfead4a01bf98ceef6b4de707.pdf
    • https://static.usrfiles.com/ugd/9c0842_672ee628c6bc484892728786ab68b2cd.pdf
    • https://static.usrfiles.com/ugd/3f4b99_bd3db536bc3049849924a45135f8cc12.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/28139187019.pdf
    • https://cdn.shopify.com/s/files/1/0438/3807/9138/files/rolefonowebod.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7345/files/advanced_mathematics_precalculus_with_discrete_mathematics_and_data_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/2006_honda_odyssey_repair_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/29127540373.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_off00008720.bin
9bd09466b823c3e0ced4b6d610f6437291b67345ec757d3478195dcad47b4399		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8720 8508 bytes
font_01_sfnt_off0000a3f3.bin
d0270928ad8b08de52c3761417520af23252631055b9ca605b88f7bd97db4b13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3F3 5016 bytes
font_02_sfnt_off0000b4e8.bin
9f106db2c7b71ce115052ade6f49562c7190705918e7c1dbeea20f91fb2351ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E8 15564 bytes

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