Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5227e60c9e1a119…

MALICIOUS

PDF

56.1 KB Created: 2020-10-02 23:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f8ec4df2c6f6160e4be0cff84dc262e4 SHA-1: e484a21a4247dc47e4bc498862c004d98f577bbd SHA-256: e5227e60c9e1a1198a92c3837b230b97e4bb2701d6acf0979987e5740395d7ab
124 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://gettraff.ru/strik?keyword=ensayos+sobre+la+problematica+curric'. The document body, though heavily obfuscated, appears to contain the same URL, suggesting it's the primary lure. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics indicate it's part of a link farm hosted on disposable domains, reinforcing its malicious intent.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=ensayos+sobre+la+problematica+curric In PDF document text
    • http://xijunufe.vtfbla.org/uploads/1/3/1/4/131408168/detukabafireta.pdfIn PDF document text
    • http://files.poolbuildersmckinney.com/uploads/1/3/1/8/131871658/7776508.pdfIn PDF document text
    • http://zegipebuj.lagumbofest.com/uploads/1/3/0/9/130970003/ruwepi_fenezewovuwoveb_zotapeb.pdfIn PDF document text
    • http://sejiguxi.artistagainsttrump.com/uploads/1/3/0/7/130775186/8f2a67eeb516a.pdfIn PDF document text
    • https://site-1037166.mozfiles.com/files/1037166/mamurezeduve.pdfIn PDF document text
    • https://site-1039958.mozfiles.com/files/1039958/60299690142.pdfIn PDF document text
    • https://site-1036731.mozfiles.com/files/1036731/girajeto.pdfIn PDF document text
    • https://site-1039676.mozfiles.com/files/1039676/kopiparimojo.pdfIn PDF document text
    • https://site-1038460.mozfiles.com/files/1038460/lemupusijajode.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/33747742093.pdfIn PDF document text
    • https://site-1036873.mozfiles.com/files/1036873/52338613435.pdfIn PDF document text
    • https://site-1037029.mozfiles.com/files/1037029/16940472959.pdfIn PDF document text
    • https://site-1036695.mozfiles.com/files/1036695/16751671274.pdfIn PDF document text
    • https://site-1036876.mozfiles.com/files/1036876/waxasumibonu.pdfIn PDF document text
    • https://site-1037106.mozfiles.com/files/1037106/84855644686.pdfIn PDF document text
    • https://site-1039950.mozfiles.com/files/1039950/riduponasomiba.pdfIn PDF document text
    • https://site-1037253.mozfiles.com/files/1037253/70553721591.pdfIn PDF document text
    • https://site-1039873.mozfiles.com/files/1039873/4958881546.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BCD 5276 bytes
SHA-256: 1265e15286df1981a47ab7cce1aa91f6a55187282c0c272c923a79f176fcf85e
font_01_sfnt_off0000adb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB2 11032 bytes
SHA-256: 04b832061aad1a1335d1689e142c7604662eaa57103c13330e35228093dbafd2

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