Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5510d06c584b9ad…

MALICIOUS

PDF

48.5 KB Created: 2020-08-22 11:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b21b49586ee69643adcafb1ffba5d8a7 SHA-1: 3aa46f86cee88c09aa597e8e5523dbdca87e6f06 SHA-256: b5510d06c584b9adf8f0639aca4f2541c987a66dc1e8cd30ce3f1335339a3f78
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.ru/pify?keyword=character+certificate+format+free In PDF document text
    • http://files.brightstarastro.com/uploads/1/3/1/0/131070089/sorexitep.pdfIn PDF document text
    • http://files.hatha-house.com/uploads/1/3/1/3/131383802/jetez.pdfIn PDF document text
    • http://xobeti.petergibsongrimes.com/uploads/1/3/1/4/131408832/vemasavewoj_mapekivipilito_kufikironitose.pdfIn 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/1/0450/1677/6862/files/anna_karenina_francais.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8157/3279/files/canadian_citizenship_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/66821257812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5251/4971/files/luramopunanufenepuludaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9508/1635/files/bmw_electrical_troubleshooting_manual_e36.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/senixomal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/78979193234.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/quimica_descriptiva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5553/8591/files/dilerifixe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/5052/4823/files/bhagavathi_tamilrockers_movies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/newabexum.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_off00007684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7684 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off0000807f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x807F 4816 bytes
SHA-256: bf1c3a41cfac4030009d274cc85eb10f1894763930ab15c60b4006ff6c115d09
font_02_sfnt_off000090bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90BB 10116 bytes
SHA-256: 0bda87617da825c85fa9c1370a55478ca2786bce96f8031a9698eca8fc85b80e

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