Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8112e5350f0d148…

MALICIOUS

PDF

44.2 KB Created: 2020-10-08 11:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c927a797fd20a68a9e80661a9e17c4fd SHA-1: ec33673909370f2a89d43175335ee2360708d641 SHA-256: d8112e5350f0d1481c4676c137d66da65bbc7ae3140555c5b6c909c5172d1dbe
184 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=fitzpatrick+dermatology+8th+edition+pdf+download In PDF document text
    • https://site-1039995.mozfiles.com/files/1039995/kimoporoxenorusat.pdfIn PDF document text
    • https://site-1039757.mozfiles.com/files/1039757/98821316812.pdfIn PDF document text
    • https://site-1036753.mozfiles.com/files/1036753/satulovuzigogaxuwuzelexex.pdfIn PDF document text
    • https://site-1038715.mozfiles.com/files/1038715/lifivabuzizire.pdfIn PDF document text
    • http://files.alibraryisonfire.com/uploads/1/3/1/0/131071082/wexutebegepe.pdfIn PDF document text
    • http://files.networklandscape.com/uploads/1/3/1/3/131382346/daxuwebowovatu.pdfIn PDF document text
    • http://files.asaiit.org/uploads/1/3/1/6/131637498/00123bcfbb9777.pdfIn PDF document text
    • http://files.kristysfineart.com/uploads/1/3/0/7/130775282/woxebajegitiwig-tubeluvo-sidemon-zibax.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://cdn.shopify.com/s/files/1/0486/3170/9854/files/gimurafixafeligalovusunus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4150/4418/files/digiorno_pizza_cooking_instructions_high_altitude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d7a7aa-cf56-4d1f-8a27-44f7a50865c1/18718167822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b005008-1638-4471-aacc-eaa6ec85dcb8/xuxejerixonekijo.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_005_off00006393.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6393 10788 bytes
SHA-256: 0dfc4eec5169a224e8730daef8ee05f0f8defa0f94af415df22ff0517ade8934
font_00_sfnt_off00004fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB6 5848 bytes
SHA-256: 8b8f85a69854bbed88b16a32f4ffeb6ad53429fe7677fc841940003796d0d172
font_02_sfnt_off00008216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8216 9688 bytes
SHA-256: 0ca867979aa305b962452891fe6bbdc3e1e4a442972b88a94329e0d1212b6599

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