Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad944cc5426ef09…

MALICIOUS

PDF

38.5 KB Created: 2020-11-09 04:34:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 06f4475bb59bab1bcc7a782f01f0745c SHA-1: 7b03640c9dc186f537d6278c5bc313bc227e50fe SHA-256: 4ad944cc5426ef097cab0e2113d9c401f7ca8b04100411d7d9527f6d991ef484
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://traffking.ru/aws?keyword=wolfram+alpha+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_5fa021f04d957.pdfIn PDF document text
    • https://nukafezika.weebly.com/uploads/1/3/4/5/134510633/pevudebik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f88af9ca8c8f.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/78d18385-db35-49b8-8594-cd6783722a13/84428029888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/033d112c-39bf-4788-a69f-802145802b6f/puzubedarusisibusubetebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f93e42-629c-438e-8cb0-35f47ceb6459/58066600996.pdfIn PDF document text
    • https://jokikujiwer.files.wordpress.com/2020/11/putaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14ea08e-7f0f-4f6b-9c9f-4dae70083a33/rainbow_rowell_carry_on_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6574e5a1-d04e-454e-80c8-c22b60e3fba7/1994_camaro_z28_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d682887-fe5d-4f4d-a505-d73c7b7ae8cc/cycleur_de_luxe_dames.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_off00005abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABB 5040 bytes
SHA-256: 7a06a59ebfd17c3bc2c1a8c9531f2f6af24037efebc69a001386e821ce3489c4
font_01_sfnt_off00006bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC4 10128 bytes
SHA-256: d0cb93d3000150705272e46d99ba990ce4955ad5adfd6cbd77f83a32f8550bde