Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82d423855e733bb…

MALICIOUS

PDF

53.9 KB Created: 2020-10-31 05:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: bed723b62152c6b77e57e55115a56310 SHA-1: 245452b00c44aef32923df48284d35fa40417f85 SHA-256: e82d423855e733bbb2959c84000b561feca15e8c02448dc826ac2febd09848e2
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://ttraff.me/123?keyword=wendys+nutrition+values In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f9b0db45b7f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f988f011a800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_5f978397eca0a.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/kodikeb_tasodisovovefe_fevajenegaweje.pdfIn PDF document text
    • https://nelibijejukeli.weebly.com/uploads/1/3/1/4/131437261/rowavivadepimuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f9683db74183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_5f9cc1f06ff46.pdfIn PDF document text
    • https://pobezewimo.weebly.com/uploads/1/3/2/6/132681951/4111191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5f952c5cec997.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/mokiwated.pdfIn PDF document text
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/857126.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/282621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5f9424e7a973c.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
    • 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_off00007959.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7959 16104 bytes
SHA-256: dcdb8cc35f27b74875ee7639aad55840220d853ba07c2b5362c61a4bd80bebbc
font_00_sfnt_off00006844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6844 4992 bytes
SHA-256: cdf964d379c30f4ebee9c496c90823d48ef7a58486272902736533d5c5940f59
font_02_sfnt_off0000a4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4F5 11264 bytes
SHA-256: b15b56c7bfa898932db4eaf2fba650adc24a0d2f908b9b2222774a518b843b25