Malicious PDF — malware analysis report

Static analysis result for SHA-256 62abb8fc820b88db…

MALICIOUS

PDF

43.2 KB Created: 2020-10-25 04:28:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8557e9cad054470a909c077bce2b2e9a SHA-1: 2e7c3e800abdcf7808bb3d53372e8a8a738a4829 SHA-256: 62abb8fc820b88dbe9c7e8be85cfef66f3e00f0cb0e0d5cc99898fad6e30bcd4
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a primary redirector link identified as malicious. The document body, though heavily obfuscated, contains a URL that appears to be a lure for educational content. The heuristic firings confirm the presence of malicious redirector links and a link farm hosted on disposable infrastructure, indicating a phishing or malware distribution attempt.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=direct+indirect+speech+worksheets+for+class+5 In PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/30b71999ce14.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/sokilijaw.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/506c5e.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/baxabusojuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f8c93e2ea801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f87a165a6ad5.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/4a741737-3052-4261-ac9e-eabc374ee5dd/buxinopazijiretidap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7731/3733/files/new_light_church_live_stream.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6378/8188/files/ravagakewizeme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0599/6966/files/7518728406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b012a26-1d61-4f01-9312-a25fa2ad70fe/20178345938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8f8ee9-8222-4262-9291-f78e57c952ee/981157398.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/71941372776.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/wafugemina.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/woxidasali.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/australia_map_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/local_anaesthesia_composition.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_off000067bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67BD 5524 bytes
SHA-256: d0a41745152c369479833e1f54ce3dbdc3ccad834a825522fdb123c9a88e21c4
font_01_sfnt_off00007aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA2 10752 bytes
SHA-256: cd156d5f07c9989301ca888bf329694c584e8e52caf93a0ad24258226a9daf61

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