Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afafbc2e1b871c2…

MALICIOUS

PDF

42.9 KB Created: 2020-09-02 08:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: da6a308760bac4d09c115d2cf795f0d4 SHA-1: bb373d126d02428c1d6f9ea00885b73d6e42588a SHA-256: 3afafbc2e1b871c283d3c7d7178a53a0788e4fd57217e7dc9d1774a358b21324
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.link/wix?keyword=severe+acute+malnutrition+treatment+guidelines In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/bf0735_07affab7dd6a418e9eb23d61074304d9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e1d12c_c166df2d075d406a9f3c1a15b1be90df.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8de238_010ffe773f8b4e34a20557a53653f63b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/80bfa9_38045b58e0c64315a52042124ab06627.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9eb187_94b2aceae47d4accbf99a5691ffe2dee.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6846fe_30e1526a7fb24c1d86d537a2f81c74f6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0dcf4b_62008e84b5f14fceb606e4b20854402e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/90c678_9c003746a23d438d9a75d45bd15e46be.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/79e0dc_13f9f159686f44fcb9ff327f1556c9bd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_765b813be39641e098dfb3974e2d5643.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a48928_808b3f8313a4481b847a0a64d5c5dedd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/162fe6_03ab6c2d7af24b1e9bb62352f67189b9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a51aec_1cff3243e6ae4acab0b9bbc82a50e0bf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ea5d7b_a96b806f6a984dd3b7164cb87953cf8f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8ebb60_ae2c811dbaa14549a3f7711a5df1b629.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/87fdc7_8b0c6259d6e24f0d91a89c6155fb249c.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_off000068fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68FC 5420 bytes
SHA-256: df6ec3cd1e19c5ad4e9c8b086fe0fd62f117368f4734756dc9698395234226fe
font_01_sfnt_off00007b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5C 10324 bytes
SHA-256: 5c26f90750c05d9898e8b3c92118383cec0f34c463e0b4b5738b9ef8dc1b16fb

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