Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dddc9c4f07cb6b8…

MALICIOUS

PDF

72.6 KB Created: 2020-11-02 06:27:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: b5264d3c05b9012233e6269aa9af2f45 SHA-1: ddf3d945323e24e1c8ed33a6d5c821c74afdba4d SHA-256: 4dddc9c4f07cb6b8fde6696046bbb96d20313f795bc747b5ac02789ffb4419a5
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=muzzle+velocity+of+22+rifle In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5f9781926b4c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_5f97c4c7dd327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5f8f754a488e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_5f9de216eaffe.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/1/0434/1760/0157/files/kivazozafopesadexiwega.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/target_creates_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4246/4166/files/33555541045.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/55465715284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ee85f9-a31e-4092-bfda-cdecc24088b2/76907387519.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5892/9057/files/milixinijoji.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F8 4836 bytes
SHA-256: 5a28a254ea75d07e68b177ba42c2b84169fe577ba998d46a398421811913919a
font_01_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 10968 bytes
SHA-256: fa55dbca60ef4421041d70117ee9aba2575a93f5feb6a2b7046ea069474e68ab
font_02_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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