Malicious PDF — malware analysis report

Static analysis result for SHA-256 620acdb89fb49dfe…

MALICIOUS

PDF

53.3 KB Created: 2020-11-01 08:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b1c671e88e8634dd229b9def2e844371 SHA-1: c42a9fb21fbe283388314a474510706e31a1634f SHA-256: 620acdb89fb49dfe180c5354fd731051e91ec68dbc8e15d5ec8a4cdcf410d6c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, including a critical redirector link to 'ttraff.me', suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains keywords related to 'Standard Pacific home builder warranty' and the 'wkhtmltopdf' application, indicating a lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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.me/123?keyword=standard+pacific+home+builder+warranty In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5f9e10a5a46d4.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/cec2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5f9650945b313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5f87fff962404.pdfIn 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/1/0484/0659/3696/files/61255830374.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/2188924155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/915320b4-84c0-43d3-89c3-c3d6b5f2f220/meworumokoneleli.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/98405697720.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/26126638195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5179/2546/files/49188874039.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/66862022003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3852/1544/files/adidas_skor_herr_storleksguide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9424/4008/files/tratado_de_geriatria_e_gerontologia_em.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b211b285-110d-4b35-9493-4f5c41d72265/48725145806.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_off0000796f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x796F 5656 bytes
SHA-256: 2e9f243f6132f40adb00c4a73e50870578b2e624811c246196f928a44b12eaf6
font_01_sfnt_off00008c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C96 11760 bytes
SHA-256: 7bf1abe4820dd0cf2fd09086e17e7dd3e2a810a7855f66cd1c32448cadaa6970
font_02_sfnt_off0000b313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB313 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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