Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c5fa2a529536aa…

MALICIOUS

PDF

43.3 KB Created: 2020-10-31 14:06:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 60e188f4452e79d944fd94f0a2728ba2 SHA-1: 921cef738289081833ceb63d0050985a9474568a SHA-256: c2c5fa2a529536aa22cd7b87b42979b218e1d4804da7ceaa62ab5b68cc0a0d70
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, it hosts a large number of external PDF links, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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://cctraff.ru/aws?keyword=american+school+in+london+jobs In PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/bagetobaba_sabaxiripijuli_vimomikepizidoz_rifaro.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/kukuximesuxus_fizoluwu.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/9697f.pdfIn PDF document text
    • https://naxupezo.weebly.com/uploads/1/3/4/3/134350891/5019622.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/364ae389-8bcf-4f15-959f-cbd167b6f33a/usher_mp3_mix_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5855/1701/files/61330754357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51843740-8126-4069-8548-3f1cc0d5348f/transforming_grace_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8924/8924/files/identifying_elements_of_poetry_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7094a8d3-daba-4278-a36c-5c8c6a6ecbc7/richard_cory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0038/5695/files/57645046438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313522ec-6cd8-465b-a837-21fbba3191c8/4619171714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e567dbdb-dcfa-423d-8832-26fb1b57d074/77164123732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d760d8-ab5c-4f7b-9d1b-b594ebd77cee/91465648315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af2de1ae-f747-4b05-a14e-ba58db1e42d0/56095389221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6563/7571/files/duwita.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_off0000695f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x695F 5384 bytes
SHA-256: 3783d4095ceee62082a9c22978ac32e76879b860717b1f8bfdf17349a8989492
font_01_sfnt_off00007b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7B 10848 bytes
SHA-256: 34ad0ddd9153a55a0e134a26b85ed41ca531092e2a3a89ca09952886e3d8710a

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