Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5d797cd8199597…

MALICIOUS

PDF

74.8 KB Created: 2020-11-09 08:55:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3b80787405a1ecb061546adf7fc21cf7 SHA-1: 18dc9c49752f3372dd41d6f8f75a4a9bbc8f9ff9 SHA-256: 1a5d797cd819959780aae827c87923e94521ab334b00115d5412c8da9cbe365e
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://cctraff.ru/123?keyword=direct+flights+from+florida+to+barbados, is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to flights and the malicious URL, suggesting a lure for a phishing or scam operation. 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://cctraff.ru/123?keyword=direct+flights+from+florida+to+barbados In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_5f8ef29f94711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f8a4b8fef85d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f9d42eee2633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_5f8e5c71b6c87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f94133fb27fd.pdfIn PDF document text
    • https://tukowozurowogof.weebly.com/uploads/1/3/4/4/134440104/82daab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5f988e7a592ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_5fa0d11cdfa52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f8a11d8587de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rakidate.files.wordpress.com/2020/11/52930778281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/931affe9-fb7e-4835-8ee6-075ebfa4dc54/60059813809.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/card_stacking_definition_examples.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC258 3120 bytes
SHA-256: 16a0685b1af8f7ff3286410c82d065b2ef9dd16f5cc5e004aadb0dd239daad33
font_01_sfnt_off0000cd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8B 5572 bytes
SHA-256: 391c8d0a20d2ec643137e11afd295138cb6de1013c78b8766fe57dda29b1434c
font_02_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 12708 bytes
SHA-256: 4efcacbff48d66d7d134608fb65910517813340ba3009025666a733bc9cba74a
font_03_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 16132 bytes
SHA-256: 43e84046d57c5d8edad47de9228ce36feb53c5e515436c294a71041590f3a3a6

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