Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc6abf7ce7e13b5…

MALICIOUS

PDF

42.6 KB Created: 2020-10-07 23:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eec1ceb306ce745e3360a9acb246d03d SHA-1: 3397fbd728c6077d054003d9ef2d127f904ef0e0 SHA-256: 7bc6abf7ce7e13b51be3f460da88f8949b15f9e2771b91da8cec9d3425448431
124 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to malicious infrastructure, specifically identified as a redirector. The document body, though corrupted, contains text suggesting it is an 'admission letter' intended to deceive the user into clicking the malicious link. The ML classifier strongly indicated maliciousness, and the PDF structure includes multiple links to potentially disposable hosting, further supporting a 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://cctraff.ru/strik?keyword=ppsc+website++admission+letter In PDF document text
    • https://site-1036678.mozfiles.com/files/1036678/buxidebarabo.pdfIn PDF document text
    • https://site-1042627.mozfiles.com/files/1042627/nilizuxiwetinakor.pdfIn PDF document text
    • https://site-1038720.mozfiles.com/files/1038720/popip.pdfIn PDF document text
    • https://site-1041866.mozfiles.com/files/1041866/radaluvorewilexapofimen.pdfIn PDF document text
    • https://site-1039931.mozfiles.com/files/1039931/xifuvuxavusetusozu.pdfIn PDF document text
    • http://files.novasparockyhill.net/uploads/1/3/1/4/131454415/9053052.pdfIn PDF document text
    • http://files.ruggedmountaintaxidermy.com/uploads/1/3/2/8/132816160/xifipewinubuduzo.pdfIn PDF document text
    • http://luxasexin.angelakaypirko.com/uploads/1/3/2/6/132682006/mupuxobidosakidu.pdfIn PDF document text
    • http://files.allforkidscenter.com/uploads/1/3/0/8/130814121/31dce57354.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/3ce265f3-8448-41d5-b346-d592ce5b89e8/jugagifububaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04247143-c1c5-4954-8a56-0a57144658bc/rinotekewaruresibawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d605cc-4669-4127-aea6-63b707528f20/kagezijiwimudew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5398d781-c3d5-4187-a33e-a40eca634317/34101892863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d27a2b8c-1b77-4995-bcce-3a453da87cfd/42547296175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44b0cf68-cdcf-49e8-932a-cb771aa224e0/mareximijegutedasofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42096159-f338-4738-8f21-9598e512a6e4/vodel.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000666e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x666E 5452 bytes
SHA-256: 2c6eb70942c2d7dc1b9fe4f511e4c2395668db6e192950d520cfefc6af262920
font_01_sfnt_off000078e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78E7 11060 bytes
SHA-256: 9e2e112b2c8a128ffa36e86347e912f769adea23ae05dc8901b79ad8330fd996

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