Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b82cdfe39d2efb…

MALICIOUS

PDF

43.8 KB Created: 2020-11-02 17:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d4557c1bd0e977e4ad22f9c854df12c3 SHA-1: 15d023d74c681f4744d1c79ef294151a65c40e3a SHA-256: 87b82cdfe39d2efbe7dd088c5751a1cc48b2029a5b1aad9971e9987b077b29f5
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector, suggesting a lure to download potentially unwanted or malicious applications. The ML classifier also strongly indicated maliciousness.

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.
  • 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.
  • 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://gettraff.ru/aws?keyword=blocklauncher+0.15.0+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f9b950904c17.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/ladojenefe/63754004711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6153/4111/files/70735762772.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/ielts_academic_writing_practice.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/5161/1827/files/clear_vision_3_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/car_wash_business_plan_in_india.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/9155/6031/files/jevobuwix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4342/2361/files/miruzes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bbaea22-22a1-4d0a-a9c7-59cc7f1b989c/65346686311.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/popozadi.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/xajelaborapopulimizope.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7215/8371/files/arabesque_no_1_difficulty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c647158b-e281-4265-be0d-508ee0cbf73d/download_superfighters_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3485/5582/files/gugitore.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_off00006aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA1 5536 bytes
SHA-256: 41331931979d0ee537c7d5edbab09bacf09356004d82b1b98d42b1382b0e3f45
font_01_sfnt_off00007d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8D 10916 bytes
SHA-256: 016241cec6765f817c5e559851125d51789b28a1c8dad7f1dd7e7d9860bbc83f

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