Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbe8e8f80931bd0…

MALICIOUS

PDF

47.4 KB Created: 2020-09-06 12:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1907ad7037eff6f6758dd518a0298e8d SHA-1: e8e04262a8210d4532b6d358e89409aeecaaeeb9 SHA-256: dbbe8e8f80931bd0095f7a473ed59fcdf5fb54c166667be831a22e3fd5539bc8
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for 'bullet journal template pages' and includes the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous benign-looking Shopify links suggests an attempt to blend malicious links with legitimate ones.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.ru/wix?keyword=bullet+journal+template+pages In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/1229/5589/files/shirt_collar_pattern.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6221/4304/files/poser_multiplication__virgule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2560/4513/files/80996898044.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/sotedexagupewavaxegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8073/6156/files/wavabulitewuvomegefot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8381/6359/files/diphthongs_worksheets_for_grade_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9007/6057/files/54619236004.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9432/7975/files/20171010115.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8640/5022/files/24248339217.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/28729970353.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/kiferexisarifodadoso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0993/2440/files/pirafebaje.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2f07a1_86c004f2e20046abab2a726be7cf560a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7041e4_967435a5ac394641843ec0b1424b82ad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66CF 5264 bytes
SHA-256: 3bb6b884fb27779fe151eb8253cd0bd867952a015f79e23e28e50b2b410fb747
font_01_sfnt_off000078a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78A8 10288 bytes
SHA-256: 2cbd7a3fff15633858742d0f53f9db70a2477635da26e3cae43ffd94736dcce1
font_02_sfnt_off00009bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD0 16080 bytes
SHA-256: 014fdb7076ebfc326e48e50914f0077be73d9a972b327c9fef30e9d59f054234

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