Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db498fcd1d9dd5d…

MALICIOUS

PDF

42.8 KB Created: 2020-10-04 15:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 144b4f8178a3e75084f5ec38a240ad44 SHA-1: fbe1f68fca85ec7f2324141429c89377bc6817f1 SHA-256: 8db498fcd1d9dd5dd029bb155f0e58cb7b67dc59c9ba505c912f3577d29e752a
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=osho+libros+gratis+pdf'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs and the nature of the redirector suggest an attempt to lure the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=osho+libros+gratis+pdf In PDF document text
    • http://files.chestnuthouse1884.com/uploads/1/3/1/3/131381756/terosal-ponoziz.pdfIn PDF document text
    • http://files.gracesiouxcity.org/uploads/1/3/0/7/130738998/sisifakelap.pdfIn PDF document text
    • http://jufis.canadianrivervalleyrevenge.com/uploads/1/3/0/7/130739693/fcb745059bb.pdfIn PDF document text
    • http://files.deiterslab.org/uploads/1/3/0/7/130738779/3557198.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/ab895fb2-778c-4e3b-b126-4f69b3b264a9/kovurolavisebixota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/506ad1ad-588b-41c6-8740-4b81e07ac915/givunitabigeraxusuzagugun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbddace5-bc4f-43f5-9cd6-70f085f7e6d1/89055313468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92b46ad5-aec7-48bf-907b-b8eb17dd4b21/6643890574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3047/7472/files/9837504609.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0603/3824/files/78583711190.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/9904/6046/files/cadillac_song_one_piece_at_a_time.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5370/3580/files/55502190154.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3665/7822/files/olney_high_school_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/571804fb-4a70-40d1-80d6-3eb09f4de5a7/95480178079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f066c3e0-7413-4e73-a401-81f492885654/39981539826.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_off0000677a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x677A 5472 bytes
SHA-256: cc33af5381d5ab2c4462b9a29775f3b279fcf0eeb9c554ea2b83d9739ce7ee0c
font_01_sfnt_off000079ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79FF 10872 bytes
SHA-256: 5130e523bb2cd329dda4f2380f4dc635aff71fa7b62f04b5e33de3b1fe7c0d30

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