Malicious PDF — malware analysis report

Static analysis result for SHA-256 2915f6d9bc1911b2…

MALICIOUS

PDF

50.8 KB Created: 2020-11-03 11:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6e8dc9155b96e5868ef327826531957a SHA-1: 3e0a323e516cc6dfcb8196b515debe6bad538c6c SHA-256: 2915f6d9bc1911b28bcab24b78d8b8d0165b2b2644cfdceb0b67ab39ca7311aa
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search results or distribute further malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous links and the malicious redirector point towards a phishing or content distribution scheme.

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://ttraff.club/123?keyword=fluval+306+pump+leaking In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f9a33476af5d.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/mobotutikujiweful.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_5f943445154e0.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/82c32ef9a5.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/9afa3facd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5f9d9dbb7b605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f87ef277309e.pdfIn PDF document text
    • https://nuvetifozeg.weebly.com/uploads/1/3/4/3/134358797/b8ee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f87c3c24668c.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://s3.amazonaws.com/tutapaxi/bioseparations_science_and_engineering_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/jolofurajutumemaxajisinin.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/87290162867.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/39136826133.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/1088655023.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/adaptations_of_hawaiian_monk_seal.pdfIn PDF document text
    • https://s3.amazonaws.com/radaruropivoje/altura_ceiling_fan_60.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_off00007b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B05 5096 bytes
SHA-256: 444e04b284df2692729f28e2b6e6b5f2452065b2e3e754aa547f8414d62bb0ab
font_01_sfnt_off00008c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C38 10648 bytes
SHA-256: e1ed4c9b4f07a435122224cccbf2318c5134d318d62fbf61b5fa8363f68a8afd
font_02_sfnt_off0000b09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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