Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1871c2d3c70690…

MALICIOUS

PDF

50.6 KB Created: 2020-10-28 16:48:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a01bb7737b306114298b8faf590df39c SHA-1: b831662fc0008023f48af87b131d9041b43cfe2f SHA-256: db1871c2d3c706907a2aae036b70369e6e6d5651e25490ce9440af1ad7046a44
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/123?keyword=sheila+keen+warren+sentence In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/art_roman_art_gothique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8915f279-edef-4a42-aa99-32fd850ca7fa/8152742920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/509c7464-5222-4c6b-aad6-d858077ccbd8/the_satanic_bible_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d0a56a-1003-45d3-8cd0-cfa614db176e/14503791190.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/aeneid_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/rogopupegukategatu.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/gaduradibazet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a45a3c6-80cf-402a-a880-367efe1e46fa/4004283671.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/90534341383.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/tuvovanotu.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/physical_science_grade_11_study_guide_free.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/99170978581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014821c0-0287-4167-8bab-96f08b95227b/43508875712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08180f21-a9e6-40e1-ac34-c001e5c3cf00/barbie_dream_townhouse.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/ebara_absorption_chiller.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_off00008815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8815 5148 bytes
SHA-256: 61c96039c89727796a08d8c473f61d4b2815afc08283bca0bcc9e83b04386e51
font_01_sfnt_off000099a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99A4 10584 bytes
SHA-256: a2daef938c21ac2135600f71286965af16c55de09bcf494ef116e0876deefb7f