Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5c9906aaa1615d…

MALICIOUS

PDF

55.8 KB Created: 2020-11-01 19:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e40e13d8211d3eb61db727e950aa03e1 SHA-1: b98c6a5b04706101f2eee08caf942618de42d96b SHA-256: 8d5c9906aaa1615dec2a11674fb32a4d8a25368ed16a2a660eca01baf263fe9d
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to link farms and redirectors, indicating a phishing or malicious content distribution scheme. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely for credential harvesting or malware delivery.

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.cc/123?keyword=triangle+congruence+worksheet+kuta In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f974ddfa82a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f8843936d021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5f9650945b313.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/e5bcd2697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_5f9c86363fe52.pdfIn PDF document text
    • https://zotadipijipas.weebly.com/uploads/1/3/4/4/134467791/tubirinipararidewalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f88b75defae5.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/ac7ee46ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5f92ba7cee89a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5f9e44f302449.pdfIn PDF document text
    • https://jafakatulo.weebly.com/uploads/1/3/4/3/134353771/kuzusamufapiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f8a9a4f2c36f.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/1/0496/0619/7415/files/tudozupuzugizumuvon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/4550/0065/files/jolufixufawigamaxizidav.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a956.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA956 24016 bytes
SHA-256: 8451c43e96210eea65b396ffc6d5d2667103f60f399c56d8787c438700dac1da
font_00_sfnt_off000071b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B5 5164 bytes
SHA-256: e580760b3385480eb779cd2f4cecd767a5ce8dc773ec63e98ad74a17da77760c
font_01_sfnt_off00008354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8354 11076 bytes
SHA-256: 30ce936d6ac21979d3512e48456acc569ec13eee87f0ef094b9cb37c0058533a

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