Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbfa13d54462861…

MALICIOUS

PDF

40.4 KB Created: 2020-10-25 22:25:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 65661d836a76ab652e532730ee812bc9 SHA-1: 30a930e1aeecc700bfe49f746678585ea935c7b4 SHA-256: 2dbfa13d54462861ad6ab86aaaa2ed882c0b82c9d22906c7510950ddd49bc2e6
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link disguised as educational content, which is a common lure for phishing attacks. The ML classifier and heuristic firings strongly indicate malicious intent, specifically redirecting users to a known malicious domain. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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.com/123?keyword=mathematical+induction+examples+with+solutions+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_5f91e33357d6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_5f89846ae7d3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5f92126382009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5f8c118e1e134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f87fdcc75578.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/kofabube/bangkok_train_map.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/5329580207.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/sixusefoburu.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/base64_decode_to_file.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/39981428566.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/zulaxokimewotofe.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/libosevututoloxoti.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/pdf_reduce_size_file.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/91681129322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7108ad-6c50-48c8-a173-6adbc3750d8a/somezojimunij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca4a319-1849-457c-b52d-31f70255082e/20068197163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc25de2c-0ab1-4e74-82f5-05d7df554919/exercicios_sobre_relevo_submarino_6.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_off00005ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB0 5464 bytes
SHA-256: 7094d6a991b47221f02fb214b3f04a71ace45f304df02e8d70626d069ca90d97
font_01_sfnt_off00006d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3E 10792 bytes
SHA-256: 39e417b80108d80c80bd84f3f04d3a4178719e34154f9bd1c5590b3f449de196

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