Malicious PDF — malware analysis report

Static analysis result for SHA-256 443ed9b8daa275f4…

MALICIOUS

PDF

45.8 KB Created: 2020-10-16 11:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9bbba4d63d45899de1341159eb5dd759 SHA-1: f0bc9f412fe482d1d88086e8ecae89f6d6bbb714 SHA-256: 443ed9b8daa275f409680ac87af8ff00c3963506a888e464f6767aad9afcd626
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, forming a link farm designed to manipulate search engine results or redirect users to malicious sites. The presence of a link to known malicious redirector infrastructure, `https://gettraff.ru/123?keyword=good+morning+and+good+night+messages+apk`, strongly indicates malicious intent. The document body, though heavily obfuscated, also contains URLs that appear to be part of this link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/123?keyword=good+morning+and+good+night+messages+apk In PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/7061675.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/14ad7f8718.pdfIn PDF document text
    • https://folanejo.weebly.com/uploads/1/3/0/7/130776558/8ef82.pdfIn PDF document text
    • https://rigonabex.weebly.com/uploads/1/3/1/4/131483185/rulonaje-zevefekapi.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/dukuz.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/sosivuzofu.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/1096138.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/fetimufodujaxo-wosofotekujazik-sodufopepoli-lofovabazejuze.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/xebula.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/3cb113af6.pdfIn PDF document text
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/zananadag_momazeji_zosud_raxejagemedi.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/vunisu.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/vunud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e54c8b-d58a-44a0-b8f5-d491e715ff4a/beguzefosumabav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd13952c-de2a-4098-8b59-9ff6332937fa/25971581679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d008c0b-59d7-4b26-98f9-994debe80081/mafiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f755fbc4-abf0-4546-b8b8-af754ef1ae55/somalakezin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96340048-ecbc-4626-b52b-de720b8852da/xagugano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6aa6468-97eb-413a-9147-cb66ed4aae44/67925284442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7707e822-76df-43d6-9adf-8333af417553/74117078414.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F36 5436 bytes
SHA-256: d5769150d6f0bbe11e2cda9c658ab64c71dd65dcc855801027ddee7a21ef2c46
font_01_sfnt_off0000718c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x718C 10184 bytes
SHA-256: 298384a7d9b58aa2e8ca768a7f81e0a2ea24e229a58d3612d2f15f21d1e8e634
font_02_sfnt_off00009492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9492 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174