Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8977c72937f2980…

MALICIOUS

PDF

39.5 KB Created: 2020-11-09 02:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: f8a7e812e0cdd9fa1e9269bb049f500b SHA-1: c5d3115647bc1831130e88e94ffcf38bc6725cb9 SHA-256: e8977c72937f29809d4ab338c535969962b5e613ea903a1e89dc5850f3d0e5b8
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://numobokofe.weebly.com/uploads/1/3/4/5/134501802/suzad_bupalepofa_puwawusad_keboxozodiro.pdf.
  • 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://traffking.ru/aws?keyword=fashion+story+hacks In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_5f928d9a312fb.pdfIn PDF document text
    • https://numobokofe.weebly.com/uploads/1/3/4/5/134501802/suzad_bupalepofa_puwawusad_keboxozodiro.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/1a27643b41869.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/e0865b7a-0a46-4f8f-98fc-d917a47d5ffa/sazudaz.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/nagagaje.pdfIn PDF document text
    • https://tugulix.files.wordpress.com/2020/11/pop_fizz_bath_bomb_instructions.pdfIn PDF document text
    • https://vibatam.files.wordpress.com/2020/11/new_english_file_elementary_teacher_s_book_free.pdfIn PDF document text
    • https://suvulabam.files.wordpress.com/2020/11/98371456181.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/alesis_dm5_pro_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/kodoz.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/wijotonanib.pdfIn PDF document text
    • https://borivul.files.wordpress.com/2020/11/39154178052.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_off00005b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4F 4976 bytes
SHA-256: 4e282a5b92987ba32b2e236cda7bbe1b0f789bb5e27523aed4d50667c0b87c9f
font_01_sfnt_off00006c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3F 10896 bytes
SHA-256: 8986eaaadb296b2b1a3c57fa0fdc31547dfc665bdea0e268a7fa7ae6e189ddf1

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