Malicious PDF — malware analysis report

Static analysis result for SHA-256 afddc0c56ef4febc…

MALICIOUS

PDF

63.3 KB Created: 2020-10-09 07:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7622010b27ccb76da56801a745545443 SHA-1: 686970fa62955f4a3ed21fd163e588995bbd5410 SHA-256: afddc0c56ef4febc9bcccd061a493bae4f986fb45512f9401b30fc6123325be2
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting services and are designed to appear as legitimate PDF documents. The primary malicious URL, https://cctraff.ru/strik?keyword=vishnu+sahasranamam+pdf+tamil, is identified as a malicious redirector, indicating an attempt to lead users to harmful content. The document body itself is heavily obfuscated and contains the malicious URL, suggesting it's part of a phishing or scam campaign.

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://cctraff.ru/strik?keyword=vishnu+sahasranamam+pdf+tamil In PDF document text
    • https://site-1039765.mozfiles.com/files/1039765/56414249832.pdfIn PDF document text
    • https://site-1036946.mozfiles.com/files/1036946/lapuruxatijiragu.pdfIn PDF document text
    • https://site-1038728.mozfiles.com/files/1038728/bijibokaz.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/gopukorigip.pdfIn PDF document text
    • https://site-1042729.mozfiles.com/files/1042729/16005836766.pdfIn PDF document text
    • http://files.seanbuckart.com/uploads/1/3/1/0/131070246/9b88f6d46a23a66.pdfIn PDF document text
    • http://files.buffalobabybums.com/uploads/1/3/1/8/131871518/pepudolafajiduf.pdfIn PDF document text
    • http://files.movingstarzpub.com/uploads/1/3/0/8/130874253/podexe.pdfIn PDF document text
    • http://fuleni.drdavidnjacobsen.com/uploads/1/3/2/7/132712336/f6f0524d667ff4.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/40162786-7771-4146-989e-edbe7666e05b/vagejadipuwelokuzojom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b59f1ee1-223e-4f61-b4c4-77b2dccc29ae/jepikafizera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc0cb053-dcfa-4d82-8295-5a0832254fad/koninopifunirixaloresomug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52186a17-c1b4-474c-942a-f862e991fe6b/xukutunixuromezudusasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0380/5600/files/wazazuxixusanis.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9027 5244 bytes
SHA-256: 1c4dbd288c51f448ce2d17d8ca14844f31ed10c3ef96fb31e5a1f36658e3bc2e
font_01_sfnt_off0000a1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1CD 2024 bytes
SHA-256: dc37461816ec92f0ed1316601fd5c6b06f5c1a5be203c138b3c3c6cdf5da3806
font_02_sfnt_off0000ab65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB65 15836 bytes
SHA-256: 4a0a1d2787f263537754c811f36b25f2e1ccb9bd3244268e21ee7ad9d4eeb0c6
font_03_sfnt_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 16284 bytes
SHA-256: 43f18b73c6b83a7361b0f82441ef3583dcb4cea91362d9c0926e05ad0fdd565d