Malicious PDF — malware analysis report

Static analysis result for SHA-256 a439f6ee3914afef…

MALICIOUS

PDF

53.0 KB Created: 2020-10-24 08:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: dc7d83e2d37ca2e36bbd79406f92d182 SHA-1: 937e6fb9e945f69c5c4578259d7277ccea1f715d SHA-256: a439f6ee3914afefb3ef559135dbe4b2a1cd81222931578b01f91bfa3f50f4f5
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gettraff.ru/aws?keyword=numeros+em+ingles+de+1+a+100+por+extenso+pdf In PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/rokememe_bisokedizuxepa.pdfIn PDF document text
    • https://butebipibib.weebly.com/uploads/1/3/4/2/134265815/170837.pdfIn PDF document text
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/8715314.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/d017bef13d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_5f8fd962e7a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5f8e512738ef5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_5f8e5a55a0a31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_5f93b473240fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393020/normal_5f8fedf2d9948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5f90116feb587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5f8c0fe235f3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f8d4a7ce5443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f87bfdc35dc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f905dc2cb4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_5f8d3c527eb29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f8ee5e49281c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_5f902d2439b7c.pdfIn PDF document text
    • http://www.opentle.orgIn 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/73169c41-df44-42d8-a539-84f34342b74e/laberojodekuwigafatep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e50f44-62c0-4d1b-b4e9-27f4d831e39e/joel_osteen_libros_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f8de2c-ea8d-4433-bd94-6971f6eef976/baby_shower_scramble.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00007d8a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7D8A 12264 bytes
SHA-256: 5852557b35f3a819b178ea58f0945f50a9a856edf488ba6e788812114f20a4a5
font_00_sfnt_off00006a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9A 5592 bytes
SHA-256: 3869e425279a363b48936088fc1d71190cfa81b987cd7530b552f6eb8d370cd5
font_02_sfnt_off0000a017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA017 11056 bytes
SHA-256: 30324857260ef0af41b5f510c78d2353c35a4506be1379b1020f892533cc2867

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