Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eebcaec3bafc7b6…

MALICIOUS

PDF

47.3 KB Created: 2020-10-31 23:04:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e210e7687c22dbdba2e6a1b3d30a53db SHA-1: 26cafd612767bd0930ccf1017217c1514e8e97c1 SHA-256: 4eebcaec3bafc7b607ae049d9211c7f32789de6f3bcde17c85e3176feec32cbd
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.me/123?keyword=bates+guide+to+physical+exam In PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/5282818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5f8a10ab42eca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404984/normal_5f9d154ce2f52.pdfIn PDF document text
    • https://lifagixuwemup.weebly.com/uploads/1/3/0/9/130969738/6f8b2abf3cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379606/normal_5f90848c8bf73.pdfIn PDF document text
    • https://foxagizak.weebly.com/uploads/1/3/4/3/134332010/9214935.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/f554c982-5771-43d3-b7f4-975267794e5d/church_of_christ_bible_lessons_for_children.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/virgin_mobile_flip_phones_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a22af0-5709-4042-aad1-13646f8063a0/rokuliwenaxaniridudefaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc1e0a1-be7a-4c7f-8e02-9c74da4b6c67/what_if_its_us_book_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4589afc-8d07-4d4b-84cd-1ae21c91611d/cadena_de_favores_pelicula_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b842fe9-d2b6-42ec-9f7c-cd0352c22afa/pinasawoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917959fb-d33a-450c-92f1-7138ac1b90cc/feather_falling_4_villager.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000541e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x541E 5608 bytes
SHA-256: 8c66264a81246055f80a77524ac117a46386a1fdfe1d31a592d4274699defab2
font_01_sfnt_off0000671a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671A 13588 bytes
SHA-256: e134cadc0c24025aaf70bff7d40c9a0065ae035f94ebf65e06e071dd337e9762
font_02_sfnt_off00008c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7A 10872 bytes
SHA-256: bb71d42cf8e540c56f989b82efc2250365b0c9e31e0d33b2ab2b007d410f9660

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