Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8b63cd5f0f9e98…

MALICIOUS

PDF

45.1 KB Created: 2020-11-08 07:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: ac0485b90bddd8c4f1906166c82a3d3b SHA-1: 420740436c63effaa03405c8642befcf24590066 SHA-256: ad8b63cd5f0f9e981186ce14c8f0a56078bcff89b0b3cbe0de196a2031b2c629
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://traffmen.ru/aws?keyword=medical%252F+nursing+senior+project+ideas In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_5fa3af8ee4b51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://lugeraropeva.files.wordpress.com/2020/11/17809607452.pdfIn PDF document text
    • https://bojuxun.files.wordpress.com/2020/11/walexufitudate.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/zawede.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/pdf_editor_combine_pages.pdfIn PDF document text
    • https://fosigitivi.files.wordpress.com/2020/11/dinonarononodarowu.pdfIn PDF document text
    • https://piwuloduvibi.files.wordpress.com/2020/11/mobepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b365a3f9-17a4-4a4b-9a94-bd5d5621111d/88984282413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/526973fd-d8f5-4a7d-b4b0-24b64eeb7dea/538052470.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/goresosuvufat.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/dyson_animal_dc07_troubleshooting.pdfIn PDF document text
    • https://napedez.files.wordpress.com/2020/11/learning_spark_oreilly_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/water_park_project_part_1_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000645f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645F 5240 bytes
SHA-256: 432a9802a87f17075722e1156a21ab46532d59637cb3ab361213b1016029852f
font_01_sfnt_off00007645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7645 10180 bytes
SHA-256: 673dab84b4b96ef3c429196741aa5924db0d6f5a6ee1e5387c1a2ecf10dd5d4a
font_02_sfnt_off00009915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9915 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176