Malicious PDF — malware analysis report

Static analysis result for SHA-256 8143960c48f3b24e…

MALICIOUS

PDF

46.6 KB Created: 2020-10-25 18:58:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a3d5f43380235248595192b061e31a2b SHA-1: 1da8285323ab1ba1e485fb8f3f177867304cc266 SHA-256: 8143960c48f3b24e408da341556fd3a3035dfc12712bc06c449080f16af84205
142 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK, which is designed to lead users to a potentially harmful website. The presence of a 'download button' lure further supports the phishing or malware distribution intent. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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.
  • 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://ttraff.club/123?keyword=snowballs+lois+ehlert+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f89fc9becf5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5f8d75646c0d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f88edb8138ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f8ababadac27.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/gulizufag.pdfIn PDF document text
    • https://sowameneritela.weebly.com/uploads/1/3/0/7/130775755/buwusulikes.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/dulukijijevos_dunuziledibew.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/8ce505c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_5f8fd8570eb1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5f8d3261e2164.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/henghuili-files/optical_isomerism_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/5999789075.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/nematodes_in_soil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91f2ba0-945b-4f20-8fdd-0684d63838c8/wojobakivesoborexulaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd6d6b3-f0a3-4dc4-aacc-76bb2f73d9c7/26579213443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ccfecf-2a43-46df-98ea-9fabf8a071f2/xusoxutik.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/big_time_sports_in_american_universities.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/learning_python_o_reilly_6th_edition_download.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_off00007833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7833 5172 bytes
SHA-256: 09bdd60607340a3ecac64d7d3fdb64a128173f1dda860f9348ae6b3fd33e0ff6
font_01_sfnt_off000089cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89CD 10508 bytes
SHA-256: bd4851e1f205f3cc92da38075195c5b470b6db9c1444017a2dd8362a120b858c