Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8837a53bf4b32c2…

MALICIOUS

PDF

42.4 KB Created: 2020-10-27 23:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6fc509076edd41fd00cddf2d013bf052 SHA-1: df26c192538ed41566de50916db0109552ce8b7f SHA-256: d8837a53bf4b32c22365f903604df3f0c4f04ae2bae91d9a790106d306867a6a
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.club/123?keyword=charles+bukowski+modest+mouse In PDF document text
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/3560493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f920badee32a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_5f9729de1ca1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5f8b95bc97b68.pdfIn PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/58dce66.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/fd7e8ca.pdfIn PDF document text
    • https://vevejeda.weebly.com/uploads/1/3/0/7/130776099/satekusaro-wigipisafex-badar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_5f92289e26312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_5f9725f9d18f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8772223aea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f8aefd98138c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3683a437-537f-40ca-8795-7bf5f22f768a/microsoft_access_2016_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5bf1f5a-b175-4a5e-8fdc-7790ba2d768c/james_joyce_letter_to_nora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1404f7cb-2faf-4be8-b005-390c031887ce/betumuxizafufuzajil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00a3271-9952-46a8-9f2c-c9490a7c6c80/masuwepuzifegaleguful.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/28977041379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1647/8110/files/threadbare_shirt_size_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3839/8869/files/meyer_lemon_bars_martha_stewart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7640/9751/files/lower_python_string.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000663e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x663E 5264 bytes
SHA-256: 4fb4e12074f810e498079b7ead8fddd34e355dde19d13c05f1c45dd5adc8d3d1
font_01_sfnt_off0000780a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x780A 10692 bytes
SHA-256: 8440aa83277d1b9cd5323db73ca01cccdaf6f4d6b6d360b67bad1080e532f365

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