Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fe4ee8fc9d24ab…

MALICIOUS

PDF

53.3 KB Created: 2020-10-18 14:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 63643ecd53ea35d827ad8397690a4727 SHA-1: 98f48bc45931ddb2c8fa1af979df8e507ab4ab31 SHA-256: 70fe4ee8fc9d24ab72c414a9f0775b747b333b7a770a64a3ef3976bf9416a473
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, which is a strong indicator of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the PDF is part of a larger link farm, suggesting a campaign to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded link is the primary attack vector.

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 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.
  • 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=ncl+breakaway+deck+plans In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f873a036a72e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5f8aedbd1827c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f89d15f4ed92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5f88d6fb935c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f87179acd9b8.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/lowat.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/71adbf4216c214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f88a9b037504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_5f8b3a81805fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f876a7dd3f6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f86f6a1ea8cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f8bafd34f3a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f8801faad737.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/57b21197-a8cb-42c1-957d-a76f921475c2/82613807398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/043585c2-dea7-481e-95be-e07291766979/46935127801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c99515-7929-4c01-9b89-cd283c989e45/woxiperawezufedive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d687b4-0883-4ee5-b7c8-2d0707e1737b/kolepivubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c60a216-929a-4ee6-9e78-624ecae7865c/bawexosazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5491b9f-4726-4606-be79-b43e08f23987/78854890663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5988bb65-7ef7-4dc8-9698-21158be0f8af/56502776361.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_off000066c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C3 4984 bytes
SHA-256: ce15024c58e84532a3720122398f6ef07a9dc4a2c0546362a738c3471faad5b6
font_01_sfnt_off000077c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77C4 13920 bytes
SHA-256: dd99e62ae2172866fa02eed561d2d8204ad03c4dc1911c9e20e20b710c78734d
font_02_sfnt_off0000a344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA344 16080 bytes
SHA-256: 82056dbd961dfb06902bd92896d68141c9dfb980cb4a86826acd1996fb016f58
font_03_sfnt_off0000b7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7ED 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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