Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5a66e9c92b5965…

MALICIOUS

PDF

62.8 KB Created: 2020-09-01 23:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1595416369f58843573cafc6cb89a203 SHA-1: 55a19f39519542d5d04d085bd46a4e4abed2a61c SHA-256: 4e5a66e9c92b5965d7a1184dff4a7276ce972c18501289be6efb216374537362
152 Risk Score

Malware Insights

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

This PDF file contains numerous links, with one prominent URL leading to a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a "virtual assistant training manual pdf" and the malicious URL itself. The presence of a link farm and a critical heuristic firing for a malicious redirector strongly suggests a phishing or malware distribution attempt.

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=virtual+assistant+training+manual+pdf
    • https://static.usrfiles.com/ugd/4826f5_a7229a1ab19144d7ae1f2f78e1f7d639.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1dbbfb8f8a042a18d05d0f8565bf543.pdf
    • https://static.usrfiles.com/ugd/6166c9_87b2de8f050244acba7e9b4dfa499ae3.pdf
    • https://static.usrfiles.com/ugd/b58d21_f60a690bd611474d9ee9fa906b72b7a7.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/85795466754.pdf
    • https://cdn.shopify.com/s/files/1/0431/8114/6280/files/57633980493.pdf
    • https://cdn.shopify.com/s/files/1/0436/9190/1081/files/65054592688.pdf
    • https://cdn.shopify.com/s/files/1/0437/1070/9915/files/65879175450.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/9270721008.pdf
    • https://static.usrfiles.com/ugd/61f964_29e1c9f2b9c5449d902403ad30c5dca0.pdf
    • https://static.usrfiles.com/ugd/9eb187_1a170cac23a94ea9b3f254285dbe7b30.pdf
    • https://static.usrfiles.com/ugd/b1b16e_5a2c704b11114117bce7fda9fde16e2b.pdf
    • https://static.usrfiles.com/ugd/a2e20a_6d7e027d88004feba6f65023f8043197.pdf
    • https://static.usrfiles.com/ugd/405339_f1d0b0dbceb24f4081fc066d9b41db7b.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000814b.bin
3c5d845de4e0f7270165521e0606e7737b394d7fcc81e5a355896dd63424df22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814B 4980 bytes
font_01_sfnt_off0000920c.bin
161da2b24476f37cd57b68b1443ec333b2d963b1f88aebe2d0a30d0b49679e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x920C 3584 bytes
font_02_sfnt_off00009fd2.bin
4ef76a3c9f0776e69b546d74b5442a0abf7de4b410d9ceef57ac8c335dce19dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FD2 10640 bytes
font_03_sfnt_off0000c46c.bin
23f32bd496feb4835362f716a112f6088464f319823a630ca3916b6f88b15fa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC46C 17908 bytes
font_04_sfnt_off0000df38.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 4324 bytes

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