Malicious PDF — malware analysis report

Static analysis result for SHA-256 183897c3ef01f6ea…

MALICIOUS

PDF

41.5 KB Created: 2020-10-03 08:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d893f66266fde680d7d847db81ca9e6b SHA-1: 93b6cfd4f611a71b914764166a60dd2206fa13d7 SHA-256: 183897c3ef01f6eafe0dc393175b6852c138066eaa6e4e270561d58505908687
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://ggtraff.ru/strik?keyword=isotopes+pogil+answer+key In PDF document text
    • http://files.sparkleelearning.com/uploads/1/3/1/8/131856446/6477398.pdfIn PDF document text
    • http://files.nextlevelpthouston.com/uploads/1/3/1/4/131437376/450179.pdfIn PDF document text
    • http://vaxuvef.carlabaku.com/uploads/1/3/0/7/130776271/1997303.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35fb3b3-e61e-46f8-98c2-af6c4101624a/36169472992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c815dc45-90af-427e-9bad-0ae822f1bd25/tekozufobanirosuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5ce8fd-85da-4a95-b785-88d8a3d4be6f/24180876031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/260bc034-688d-455f-8adc-0d7d83936614/xeposoviwetil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7bd925-a7bb-45c1-902f-3fe563c6be90/mifedusavisowufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb4569b-0b2d-4981-83ed-2bde7736e7d5/toxobatuweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8ebc73-5b1f-40e4-b3a8-1c0190d389b0/punuvegud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8722fc57-5836-4317-9be1-198804da0752/xogiruzofogapivasene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7902/3257/files/lovenawosuzepenifenak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/4588/8415/files/54236265376.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/angles_at_a_point_worksheet.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_off000063d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D0 5180 bytes
SHA-256: a220e98db570241483feb8dba2c525a041313e7ce6db8d3015c7d1f15a5b42c3
font_01_sfnt_off0000759e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x759E 10528 bytes
SHA-256: 0440ec1397c59956ea4184413cb7cd34a5dad6d18f1d9887f7cf30445c816c08

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