Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c73a6289566ff8…

MALICIOUS

PDF

49.6 KB Created: 2020-10-28 17:14:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 616c6b109b019067bc007869b583f5fe SHA-1: 24d26cbb50f83702d3ef426aaaafc1e3428a656a SHA-256: 24c73a6289566ff83f98ccd990aa2edfcd56c4080f44f4df9093a52811e7e824
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.link/123?keyword=long-term+liabilities+meaning+and+examples In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392439/normal_5f990bdba0e5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8b4971b58ab.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/26fa3ab8-6b11-49cc-b44b-eb4bfc4af84d/54252758557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b107211a-6325-4631-b4b9-f8bd5707ccbd/60801553598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ceee9c1-c82a-4a9c-a4fa-421aee1f17e5/77871612899.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1651/8805/files/mumaxejodopasakibategaxin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae2211f-abae-4ef2-afec-dc193431cb34/30051513880.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/7538/6791/files/homegoing_yaa_gyasi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4346/2561/files/chemistry_formula_calculator_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8436/4954/files/zawab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8a1c73-774d-412c-be73-1bdb03901370/gujoso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/34149608813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa993a9-4e95-4a57-b629-d461973fad81/access_to_health_13th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/susikubaganujusibidaden.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3943/9032/files/59937134882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b35689-ff77-4ec0-b970-88bf86b7d582/72044701087.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8190/6361/files/ronidabavifitigolelupiro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6381/3020/files/xisamosagowojiremuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd574a7c-1d80-431a-ae11-40b7f6360fb5/pisukajuvonuzagafunodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563af5a1-aa2f-46ba-aaf6-7818b768ce53/32089267992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12885828-59ef-44c6-a17f-ae641777f772/15000036834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd029ad-df47-416a-9d18-8b4011af4950/xinatofebukukufex.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_off00007110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7110 5248 bytes
SHA-256: f6ac323adce760332deecac95031c6689e88a0cb1652246de992a3685bac67ad
font_01_sfnt_off000082cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82CD 11556 bytes
SHA-256: 5e9fc23d54ee03035d114b3cec4f369d84418a5864891ac2409db23bff3c11c7
font_02_sfnt_off0000aa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA34 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34