Malicious PDF — malware analysis report

Static analysis result for SHA-256 1193d53f0ebb067d…

MALICIOUS

PDF

73.2 KB Created: 2020-12-19 07:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 001d258102b232bcef497cbf1a23a6a8 SHA-1: b8e16e094e80dfda485201b1579e9b113c5c668d SHA-256: 1193d53f0ebb067dc5a0e568dfe5d61af3db8ae3047c8313662e6418e6f78de2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?utm_term=hungry+shark+evolution+apk+hack'. This URL is presented in a context that suggests a lure, likely for phishing or to download a secondary payload. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL in a PDF document is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=hungry+shark+evolution+apk+hack In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_5fd6c6733d52c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f89a3f41f77f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383300/normal_5f9f69894a33f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5f8a57e615511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487424/normal_5fd7b55bc87ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_5fbd619ddd4e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501486/normal_5fd03dd31d15b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc36ab7a879396864183595/t/5fd1239fb295ae7a14b172da/1607541663383/lethargy_pronunciation_and_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4765a045-d11c-438a-97fd-b36c9cc19a15/96310443127.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD184 3552 bytes
SHA-256: 73351551b4e887fc8371af48ecc3ee675643d48e33b2d8877faaf2ae66d3fa55
font_01_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 5380 bytes
SHA-256: 7a96a3cac829c719037c8be9d138bc3f673f6b5b731d874903a9b8e81fba06df
font_02_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 11268 bytes
SHA-256: 155fc4dddfd9a1e76d7c10335469f478535836d641e2ba7b8af1c561cf06186b

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