Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c1712334b8de8c…

MALICIOUS

PDF

42.1 KB Created: 2020-09-17 17:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06f449655b85a6e457fdb2c8c401bbd2 SHA-1: dfc32f9cd415345e62df4df35af32f044cc4aa0f SHA-256: e2c1712334b8de8c3a820e536e2e7f764a67076694c10fc523c21ed6fb472d13
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The document body, though partially corrupted, suggests a lure related to academic worksheets. The primary malicious activity observed is the redirection of users to potentially harmful external sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=chapter+9+frontiers+of+biotechnology+worksheet+answer+key
    • http://files.rebeccalynnphotography.net/uploads/1/3/0/8/130874518/4840188.pdf
    • http://files.nestmusic.org/uploads/1/3/0/7/130738943/8145325.pdf
    • http://juzafa.shopblmboutique.com/uploads/1/3/1/6/131607305/koziwipaw_gipumaji.pdf
    • http://files.kosative.com/uploads/1/3/1/3/131379014/1883196.pdf
    • https://72745d79-32a7-4d9b-bc9e-aaacc6120646.filesusr.com/ugd/2d797c_1536f416796841078f74f17e1c02cb52.pdf?index=true
    • https://ab8b101d-ea10-455d-8f1a-095971b25ec9.filesusr.com/ugd/ac8c68_efc5a58d7e554f918dca89bcd1238d25.pdf?index=true
    • https://324c1c7e-9747-49d6-80c5-89ee8e6b4ffe.filesusr.com/ugd/b926a8_1c666788c5aa46bd9a286898603bb9f8.pdf?index=true
    • https://cfc0260e-ed62-46a5-a2cc-1684e6b90240.filesusr.com/ugd/115d6e_bc97b344898749028ede3695ae744e02.pdf?index=true
    • https://e846de8e-0d54-4cfc-b0f7-492ccdff7172.filesusr.com/ugd/f91cf1_1f948289f7be46b68087b88fa688bc42.pdf?index=true
    • https://eea8265a-0adc-4cb8-b384-21a265a3eed2.filesusr.com/ugd/668a47_471659e0d90e4478969d4e3a4b62020a.pdf?index=true
    • https://dde93aa2-837c-4b98-abf1-40b80f3be65b.filesusr.com/ugd/ff68bb_2ef21238285c4d82bb45dc9f2ec79a4e.pdf?index=true
    • https://810e9935-db3e-450f-b5ba-3430556c1c50.filesusr.com/ugd/c345b0_17a9a63037634f69bfbf1023c5f83af9.pdf?index=true
    • https://ce897b55-0e2f-43e8-8633-c698fd586f50.filesusr.com/ugd/3d0627_fa56f6e337bc4cd496d4bedac1ed38aa.pdf?index=true
    • 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_off00006527.bin
c9b7b9c3d4f0e01b4e420b7f86ba62b5b821c32042b601ecd5326d2038eefeda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6527 5736 bytes
font_01_sfnt_off000078bf.bin
549586f6505d4a598babff74a91604b73acb9109cdcae116f14452aa4df69280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BF 10036 bytes

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