Malicious PDF — malware analysis report

Static analysis result for SHA-256 68aa3f77dc56588a…

MALICIOUS

PDF

34.2 KB Created: 2020-09-17 14:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b76cf3179d070f49b5960c3a58a10c3 SHA-1: 7d8d4216684d5294f26eca1cd5e0b446e8ab21e5 SHA-256: 68aa3f77dc56588a2558c10c07be9d83925b090f68746216fedc58e451461de4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to attract search engine traffic and users. The presence of a malicious redirector suggests an intent to lead the user to a malicious site, potentially for phishing or to download further malware.

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.club/wix?keyword=truman+elementary+school+utah
    • http://files.uusandiego.org/uploads/1/3/1/0/131069887/zawejefasabavimu.pdf
    • http://files.joshreynoldsyeo.com/uploads/1/3/1/6/131606295/modajegojezuzu_malubejigin_perudaros.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ae2cd7d5-af50-4f6f-a283-a5b3b0e67fa1.filesusr.com/ugd/3ce946_7b6be7ea17d84b579b2106ed2d157f60.pdf?index=true
    • https://6f82bb30-b76a-44e7-b8dc-6327e316028d.filesusr.com/ugd/e66789_89aca5ea8115436dbe33092b41f1522e.pdf?index=true
    • https://c2af1ac2-5b24-429a-b425-d7d89ae97780.filesusr.com/ugd/738632_2f21be1bf7f84748b3868be436bb5693.pdf?index=true
    • https://6ab29574-7848-418a-89ef-5ae3d2f08bd7.filesusr.com/ugd/1e533a_77361ba93db04038b128c2a8a5c5d3dd.pdf?index=true
    • https://0905199a-9085-4d43-b89e-b191c6743a44.filesusr.com/ugd/f08e01_5a527b8a038d4177a4f0f9f9030aa857.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/pitozugugofesuji.pdf
    • https://cdn.shopify.com/s/files/1/0446/8424/7193/files/99966255678.pdf
    • https://cdn.shopify.com/s/files/1/0438/3028/0352/files/tagedurirovizenat.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048d9.bin
e6970a630dbeae8ee20baffdb5dddababc012f83323166a6ef3c98c6a6d22e20
pdf-font-stream PDF embedded font (sfnt) at offset 0x48D9 5092 bytes
font_01_sfnt_off000059fd.bin
e67ecf3a7722cbdea567f36fc77105ae7b99d0d440fd132638184e23af69239f
pdf-font-stream PDF embedded font (sfnt) at offset 0x59FD 10056 bytes