Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caa78378c6cbb9c…

MALICIOUS

PDF

43.5 KB Created: 2020-10-29 22:07:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1750da6366819fe5ce1193f5eaaf783a SHA-1: b2ff737371eeff8808c4bea8f4cbd0938a72ca78 SHA-256: 5caa78378c6cbb9c8d9766786894bbe3ea85e72f6bcb1776b5eb96a427e7d86f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain the URL for the malicious redirector, suggesting an attempt to direct users to a harmful site. The ML classifier also strongly indicated maliciousness.

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.club/123?keyword=data+movement+instructions+in+8086+microprocessor+ppt In PDF document text
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/logakinanoken.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5f88ab865ea8e.pdfIn PDF document text
    • https://rubazepenomul.weebly.com/uploads/1/3/4/3/134324915/junufivimiguveg_limadijememunej_roxavotu_roguguroset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_5f98ae595f492.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/7738027.pdfIn PDF document text
    • https://xotuwajugi.weebly.com/uploads/1/3/4/3/134349857/dotiwisoxoz.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/4c2f066b-dc2f-485c-998c-04cadc6d4c73/love_scenario_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1beb8f-03e7-4534-8de9-e43d08200874/96523723007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fab8539-6209-4ed2-a000-e5c6739fa7d5/85564360622.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5873/1429/files/duxesewifomada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4797/1735/files/curso_de_termoformado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2479/6829/files/38183971827.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8471/9274/files/84136836880.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3019/9495/files/3488730901.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7612/7394/files/high_school_musical_3_songs_in_order.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_off00006a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1B 5596 bytes
SHA-256: f19da9472ba2da3d656b2b17c51353c98a8e10ffaec4b70c965025760389b544
font_01_sfnt_off00007d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D12 10208 bytes
SHA-256: 57ba47ea518b8113f8d5260ef71eeb3821d5c948e4ed35651fb0845a02036074

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