Malicious PDF — malware analysis report

Static analysis result for SHA-256 6370716f4d7d44b7…

MALICIOUS

PDF

46.0 KB Created: 2020-10-12 03:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 487803f1d7b6edea4cd69275b67c794e SHA-1: 7aa1f8f2346b6176beef35272d2f74e0139ea1d7 SHA-256: 6370716f4d7d44b717c2cb2cb0e8b7305c830021c7f2788e488df58447368832
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=comodo+free+firewall+review`. The document's content, though heavily obfuscated, appears to be a lure related to a firewall review, combined with a visual download button. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used to deliver a secondary payload or lead the user to a phishing site.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=comodo+free+firewall+review In PDF document text
    • http://files.robertmrapp.org/uploads/1/3/1/3/131379971/8450402.pdfIn PDF document text
    • http://zigufinob.cfbsradio.net/uploads/1/3/2/8/132815110/149328.pdfIn PDF document text
    • http://poriw.thomasvis.com/uploads/1/3/2/6/132682883/jaludivefidijeseve.pdfIn PDF document text
    • https://site-1039190.mozfiles.com/files/1039190/vazodazizewipamozavo.pdfIn PDF document text
    • https://site-1036678.mozfiles.com/files/1036678/taxikesajikewonox.pdfIn PDF document text
    • https://site-1036917.mozfiles.com/files/1036917/72580195816.pdfIn PDF document text
    • https://site-1043165.mozfiles.com/files/1043165/43745532730.pdfIn PDF document text
    • https://site-1037268.mozfiles.com/files/1037268/69540739072.pdfIn PDF document text
    • https://site-1036902.mozfiles.com/files/1036902/nakoxumonanavofa.pdfIn PDF document text
    • https://site-1039642.mozfiles.com/files/1039642/28852065569.pdfIn PDF document text
    • https://site-1042181.mozfiles.com/files/1042181/rolagafe.pdfIn PDF document text
    • https://site-1043117.mozfiles.com/files/1043117/sezasifurisafojikazibuzuz.pdfIn PDF document text
    • https://site-1036985.mozfiles.com/files/1036985/21235002932.pdfIn PDF document text
    • https://site-1037212.mozfiles.com/files/1037212/35978434040.pdfIn PDF document text
    • https://site-1038919.mozfiles.com/files/1038919/dadiwegukoleravulanox.pdfIn PDF document text
    • https://site-1043034.mozfiles.com/files/1043034/rilimakuwemakiragano.pdfIn PDF document text
    • https://site-1040036.mozfiles.com/files/1040036/67790575553.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_off00007664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7664 4932 bytes
SHA-256: aca1d993b3d70dca7a19820702aad8cb8bd7da1bab3f7cb2d3767613f9d69bc9
font_01_sfnt_off0000872b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x872B 10428 bytes
SHA-256: 8e79e6edb22b25fce2f6b0d4fa5ce1cc271f04d9439ab440f2539f9580a9c979

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