Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ab019d61221586…

MALICIOUS

PDF

42.0 KB Created: 2020-11-08 11:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bf8dca6c32dc19901bbe22f8b556bb32 SHA-1: 1d17380dbfcee80b8d3c9e60db22fc4eb92346e7 SHA-256: a1ab019d61221586d1b0498dcd869162cf649ad5034bede82aca2e1a244545f7
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to redirector infrastructure, specifically 'https://traffine.ru/aws?keyword=dynamics+physics+classroom', which is flagged as malicious. The document also includes a link farm of 26 PDF links, suggesting an attempt to manipulate search engine results for phishing purposes. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing lure disguised as a free download.

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://traffine.ru/aws?keyword=dynamics+physics+classroom In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_5fa7420f8c256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5f90d56294373.pdfIn PDF document text
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/4492314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412159/normal_5f9672c23f74b.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/18c722bb-98b0-4166-9df6-5dc1101eb7a7/device_unlock_app_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19231f6-173c-4112-acbf-4cf1d3586383/wesimasuvebanenof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3612d968-781c-4ed8-8608-77f95077e073/14231677993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea6018a-fcaf-4900-93e7-edb3e60b3181/fufomikonixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b80c915-c733-4731-b978-9420314fde48/libro_viaje_a_la_semilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/597e377f-1d5e-4161-b17b-7cf3261ed192/91354829007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef3c4bf-d43f-401e-8e45-ad5f704b50ff/xetamudewumanivezow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55fd1045-5175-4c0e-826e-d87a4174d3ca/38689551962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092711ad-19ea-4714-ac48-5215fbb371e2/tesoderofop.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_off00006654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6654 5272 bytes
SHA-256: bda258a5c57e5691c2d2764220fbfdca8a394e85c4c25a4e7ca2d5dc42eb24d9
font_01_sfnt_off0000782a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x782A 10180 bytes
SHA-256: 49dfded75cc936fda956d576eabe4588370fde052029ddef2c6af9cd754c060a

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