Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57afb997a7016f9…

MALICIOUS

PDF

40.9 KB Created: 2020-11-05 21:30:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: f87d7b918026ee1294f6bbad6a235f13 SHA-1: d83ffe429a7dd7633b189c66cd53492ac3f18428 SHA-256: a57afb997a7016f9987f4c0250f7eedccc6504ed9c3954fa1675c07d1e2508b4
202 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/aws?keyword=androdumpper+apk+for+pc In PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/3f30f6e4a31b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/37524553027.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/amplified_bible_app_for_kindle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d6a3d1-481b-4a16-9f70-a7566ebba36d/winulademiribitigofujus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a4186b-d3d9-4e51-a9bc-ed1840583404/mapumiwil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19c8f93-b61a-4a6b-8f4d-f8f93b95856e/31626826079.pdfIn PDF document text
    • https://s3.amazonaws.com/dafalebinoza/67156406822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dabe667b-29bf-4d6d-a48b-0fd61d658b0c/2099725668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e26c6fd-e5f4-4fd5-9afe-09cad4e5ebd0/purolator_filter_cross_reference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23555ae-b47f-4f30-9f93-a88e3cf4b4c7/curso_de_calderas_de_vapor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01a72e8-9014-4dd0-9784-b7f3aeb7952a/vewunozab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b183d387-dbfd-4b09-82a1-077f79b90cf0/anniversary_update_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f9cd85-3833-46de-a15e-c50fbe82b076/86944163771.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_off00006288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6288 5144 bytes
SHA-256: c249d9807233e09ad3704a1a7e462219c2bed851ec6a9f8c98bae88920dba584
font_01_sfnt_off000073fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73FB 10164 bytes
SHA-256: 62e6b249180a42e6dc68c4a5732002df4be7d1ed5f6ed954a909f011f044915f

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