Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6811da106db092…

MALICIOUS

PDF

39.8 KB Created: 2020-07-10 09:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bcd3a2ba6c7dcde33562994dbace5f9 SHA-1: ec83589bf0e53a2955a0179f7b1253a2f60c04e1 SHA-256: ba6811da106db09204eaf289bf5c9d06a13cbe7a8762936498d57e34a519e951
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Hurst critical thinking application nclex review pdf', suggesting a lure to disguise the malicious intent. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content. No scripts were extracted from this sample.

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/wb?keyword=hurst%20critical%20thinking%20application%20nclex%20review%20pdf
    • http://files.biophysical-ecology.com/uploads/1/3/1/4/131406356/xivut_girusidusowele_finusagon.pdf
    • http://files.ukuleleforteachers.com/uploads/1/3/0/9/130969865/sabezoro.pdf
    • http://files.booneiowasoca.manriquez.net/uploads/1/3/0/9/130970016/778641.pdf
    • http://files.keepitcleanldn.co.uk/uploads/1/3/0/7/130775700/dofapuwu_rufewef.pdf
    • http://files.mectacprinstructor.com/uploads/1/3/1/4/131437740/2f469132278.pdf
    • http://files.mrrizzi.com/uploads/1/3/1/8/131871727/sizop.pdf
    • http://files.linhr.com/uploads/1/3/1/0/131070189/tabotusatoboza.pdf
    • https://wijelofa.files.wordpress.com/2020/07/pinamisadimipejamopife.pdf
    • https://zifumopof.files.wordpress.com/2020/06/lenixesev.pdf
    • https://nuvekutivuj.files.wordpress.com/2020/07/tumulogadirewaxup.pdf
    • https://korovitezu.files.wordpress.com/2020/06/60315291563.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mekokagowofulagifofid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96951977507.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bizisumexu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64630415929.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/temufaxilagig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54341666742.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34707652888.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_off00005a25.bin
ededf0a2cf701cc8bd1ee46a1a72032b8c034740632b19096e0f1d56e60fe3ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A25 5544 bytes
font_01_sfnt_off00006d07.bin
d97699814aa9e8b5e5364d306b4c3cc01407de2ae66a1680ae4cca8a62688982		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D07 11024 bytes

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