Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7a3a747ae7893a…

MALICIOUS

PDF

43.6 KB Created: 2020-10-31 04:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3e25988cbd2484134ac0e142d44eadb9 SHA-1: e7df5942ba53083e88892d8b3ef8f1624f3da57b SHA-256: 5a7a3a747ae7893a74e1bb135d327da5bcde2d0b9f62e3130b7697e386adcddd
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/123?keyword=sharp+el2630gii+manual'. This URL is likely used to redirect the user to a malicious site. The PDF also contains a large number of external links, many of which are benign, but the presence of the malicious redirector is a strong indicator of malicious intent. The ML classifier also flagged this PDF with high confidence.

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.
  • 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.
  • 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.me/123?keyword=sharp+el2630gii+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f87321d5de35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_5f971999efc58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389568/normal_5f9555b19825e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9665/7058/files/modal_verbs_worksheets_for_class_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e403ab55-1e92-4f19-89c0-8daa007aec40/el_libro_del_cementerio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a4a588-fa73-4373-b789-c9d42576eb4e/dosezanimavuxedisakem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbccc840-3645-44b8-90df-b9a8d0d24d79/philadelphia_movie_kickass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e32187-3398-463f-92a0-88c6b40b31d2/81401369897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec46b2c2-3521-43ed-a487-288f461214c1/71158593776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604ae2da-3dca-4810-bb9e-0da83e28b66a/60986674136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c09f0a-b8bd-4d33-9ef9-e5cf5f823c86/78120628834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f2934f3-6811-49f5-a3fb-eb4354c985a4/51188671935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af6e7dac-a32e-4d31-b202-7a6a6f0982a5/74208133378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4bc0d18-3e0b-4d68-a4ad-2e941886f21f/wezizodefasapuvudefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99659c5-8796-4530-8d98-10e4e6b17132/veludemezadukuka.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_off00006819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6819 5748 bytes
SHA-256: 3acf1a11841addb24d1ecc84ca05783437c5f19668eca30eaeecbd1401163ce2
font_01_sfnt_off00007b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7F 11248 bytes
SHA-256: 689dd859428324031fab99b3707f2f59ce8b0b59f4e150a157a1fdc1001a36e4

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