Malicious PDF — malware analysis report

Static analysis result for SHA-256 492c6abf1361b0c3…

MALICIOUS

PDF

45.0 KB Created: 2020-08-29 22:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf40f2e38304b37b9d836a1855c854b7 SHA-1: 9c46cfda337383a5a20e8dfae3ba6503ed50cfaa SHA-256: 492c6abf1361b0c37c9a81951ebcf78e60d833df722b06816135af5f9a2796eb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains references to this malicious URL. The presence of a PDF link farm heuristic further suggests an attempt to distribute malicious content or engage in SEO abuse.

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.ru/wix?keyword=aci+ask+s%25C3%25A9rie+subtitulada+em+espanho
    • https://static.usrfiles.com/ugd/05900a_9d3d02af9598417b8c26f4f6870048ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9f6869b972445329dbd2fbf0133938f.pdf
    • https://static.usrfiles.com/ugd/b8c837_770529f384cc46e985d680319b9a3c68.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd3b8e362a2e4060896fd3ae632f73cd.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_aa3058ae3a2946e9a19b8ed15a037ca7.pdf
    • https://static.usrfiles.com/ugd/b8c837_01436e5cf17443a6b313bf18edc2cb05.pdf
    • https://static.usrfiles.com/ugd/74c34a_d2f41faf721249168b77ea0c03ae4f41.pdf
    • https://static.usrfiles.com/ugd/b8c837_2150e9f0dea54ed888cc0ed45ba302a3.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4364/files/free_abstract_reasoning_test_with_answers_and_explanation.pdf
    • https://cdn.shopify.com/s/files/1/0431/5263/8116/files/jeput.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_off000056c9.bin
aa0794533d6e80102cc67320a37fc1d8a4d79a56cd8dadb0cf9499077b39cef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C9 5648 bytes
font_01_sfnt_off00006976.bin
6c4fe7aa28d10bab1bdda258d3fdd737565649908c237edb1a092fec3e48b72e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6976 11852 bytes
font_02_sfnt_off00008e69.bin
e89e7cbc2cd02ed54182decc4e3c1541461b871a8e62533d99959f539d8af1e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E69 16488 bytes

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