Malicious PDF — malware analysis report

Static analysis result for SHA-256 9368aa3b7fd3cf24…

MALICIOUS

PDF

73.9 KB Created: 2020-11-04 08:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5d4bdbf95e132f09354b37f47c687b31 SHA-1: 9dcc3017f836bedf0d4c5c9dcb71eaf1882cf467 SHA-256: 9368aa3b7fd3cf2476d0bf332e5372da0d0cf435b3f3c15d14cf41085ac8eeb2
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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.ru/123?keyword=frq+ap+biology In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f86f851aecd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f9c6001bea72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f87359c56239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_5f9535855d965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f89256e5f8ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_5f9386ba1a715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5f8a90da4f678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5f9e580394102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5f9a98a96a0f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408485/normal_5fa1d10c5dbaf.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/1/0500/4043/8948/files/26659463307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81749790-7b63-479d-ab9f-9f8231fb8edd/emjoi_micro_pedi.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/44944920734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6344e67f-abd4-48d3-972f-1a314eb23fdf/8751747373.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3893/5720/files/citizen_watch_serial_number.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9565 5132 bytes
SHA-256: e9c421d7410437455f853c0e7e4e0084d25655ce5c102228e41a891d216b01ee
font_01_sfnt_off0000a6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6ED 15408 bytes
SHA-256: b2ef5190e37bdcb6967672bb06139ce65f12a537c905dfa6b166d304855242e0
font_02_sfnt_off0000d11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11F 11656 bytes
SHA-256: fd2fb462bc40d8ce1569534f9a9533ce7fa8837b690125216ad30402c2e9ca7d
font_03_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 17112 bytes
SHA-256: 205556319db20e1e0c1ba72a111f1d2aa626d05c2e84ea9d771cb9e6e484772d
font_04_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 1748 bytes
SHA-256: fc9aa48e79ccc6e0f914b4748175334026105657c0013aac1cfefd8d71ef0bcc

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