Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a52603d79e01c5…

MALICIOUS

PDF

44.1 KB Created: 2020-08-17 09:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 760ae84504bf0f1a3bedfb97bc4e6821 SHA-1: 55c56c0067379f6290026beac15f9e8d23db4d1b SHA-256: 90a52603d79e01c57301b4fb942fb4d454530fbbc97c44f363961bfa96151b94
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=explorations+in+core+math+answer+key In PDF document text
    • http://files.peaksandplainswoodcraft.com/uploads/1/3/2/6/132680974/vezuvufefora.pdfIn PDF document text
    • http://files.batmq.net/uploads/1/3/0/9/130969435/8069310.pdfIn PDF document text
    • http://files.romans-group.com/uploads/1/3/0/7/130738978/eadf6b0c7533.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/1/0432/2007/4663/files/84330240794.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/27079299040.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/58001605888.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/37729890777.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8829/8662/files/meluvogivapalulam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/mejapezupirixajofimu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/2219/2537/files/cashier_job_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5625/1555/files/kepekusilux.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_off00006c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6F 5456 bytes
SHA-256: 17c7a248f2f63d06954bae2a5e82f72645860da1006de089d625bc258b6ac7f7
font_01_sfnt_off00007ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE4 10732 bytes
SHA-256: 8750588cd02045a1d78d561c13cb3e99c91457e1168e2cf852a78586d0a4a91e