Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e6d5b78edf273d…

MALICIOUS

PDF

42.5 KB Created: 2020-10-06 18:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 45f123389fd307b6219edded7e5e02c4 SHA-1: a6b7de34fbdbc8722954863cf72e1ee37956c061 SHA-256: d9e6d5b78edf273dc70eeab77185f479d74a2333484090bd11207d6c84ae06f8
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure for a browser extension or update installation, disguised as a lawyer's manual, and presents a fake CAPTCHA to trick the user. It links to a known malicious redirector, suggesting an attempt to download further malicious content or redirect to a phishing site. No scripts were extracted, but the presence of multiple PDF links and a malicious redirector indicates a high likelihood of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gettraff.ru/strik?keyword=msba+maryland+lawyers+manual In PDF document text
    • https://site-1039954.mozfiles.com/files/1039954/28491016799.pdfIn PDF document text
    • http://mamije.englishappliedlinguistics.com/uploads/1/3/1/0/131070317/sogezas-rejibizog.pdfIn PDF document text
    • http://veneda.alisikamainecoons.co.uk/uploads/1/3/2/6/132683001/9182432.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f5fcbc3d-f6ac-44cd-bf01-a63817db4b44/meralimezabejeligow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3cc32bb-46e0-4c16-92a1-1572c0b159dc/22533383720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9672807-6131-422d-871d-34d503215dee/wadosodekojo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8271/8107/files/memphis_botanical_gardens.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7135/4533/files/bodinarurusun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1694/4796/files/wedogikifireso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/xizanelazakamikafaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9306/5881/files/precise_fit_lawn_sweeper_replacement_parts.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A80 4952 bytes
SHA-256: 09929c03148057304901b68c022ee0b536fe3aafc5cfee59fec31b9001584336
font_01_sfnt_off00006b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3F 10568 bytes
SHA-256: cb01988cee252d2f2897aa5e5afd907f5cd47350d5a67a7d9fd6e4bf958aac71
font_02_sfnt_off00008f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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