Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7f56ca0efce653…

MALICIOUS

PDF

42.1 KB Created: 2020-11-04 03:14:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51380cc0dc566d6e857d912ca5c30fee SHA-1: 1db7207fba590f0fe62e2d395430755998fa6c22 SHA-256: 0c7f56ca0efce6531c94c6f9a31bf8a63a9d0c4ec6415fc7f1f3ed8b13919212
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, directing users to potentially malicious or SEO-manipulated content. The primary redirector URL, https://ggtraff.ru/strik?keyword=4th+and+goal+unblocked+games+at+school, is flagged as malicious. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to harmful sites.

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://ggtraff.ru/strik?keyword=4th+and+goal+unblocked+games+at+school
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5f87a76946b81.pdf
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/wagojasenulufuxe.pdf
    • https://cdn-cms.f-static.net/uploads/4402519/normal_5fa1e1ee1a473.pdf
    • https://cdn-cms.f-static.net/uploads/4381347/normal_5fa07ee4de350.pdf
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/fd0cfeca78027.pdf
    • https://cdn-cms.f-static.net/uploads/4402710/normal_5f93946aebc93.pdf
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/5829622.pdf
    • https://cdn-cms.f-static.net/uploads/4383805/normal_5fa1dc69359c4.pdf
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/nakalitesesax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/19210de2-d422-455e-9636-b066b88bbf87/govirolesesozapeve.pdf
    • https://s3.amazonaws.com/pizexopenaxu/4842048981.pdf
    • https://s3.amazonaws.com/gotijejaj/dl-90b_printable_form.pdf
    • https://s3.amazonaws.com/lopazura/61913419242.pdf
    • https://s3.amazonaws.com/divelikubapiwaj/a_an_the_article_rules_in_gujarati.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058ab.bin
2140ed87d6d9dab425290d59d716e9df3e748a3b4d39a6a30ec8746e91e484e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x58AB 5288 bytes
font_01_sfnt_off00006a7a.bin
f882d8c3f04381516f1b9a18ed95b1db5e24512290ba4c6004d1ef7e175f41b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7A 10216 bytes
font_02_sfnt_off00008d68.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D68 4324 bytes