Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf46598961d7283…

MALICIOUS

PDF

71.5 KB Created: 2020-11-29 22:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e04fe7b29106edf9bb8a9e4a482df4b0 SHA-1: e2e74375ff1ce2be7e4ca28083f63eda6107d6b6 SHA-256: fcf46598961d7283c710696db98b8e8cc6da649c0b208abbfab50fc77f3457ad
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it's a malicious redirector link, pointing to 'https://ggtraff.ru/aws?utm_term=bluestacks+pc++windows+7'. This URL is likely used to lure users to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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://ggtraff.ru/aws?utm_term=bluestacks+pc++windows+7 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5f99b28b5e0c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d1663f0a-a939-43b8-9452-e21b64f80ac9/tsardom_of_russia_anthem.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/xawokatisixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc9c6780-b2a6-4736-840c-7dc002d60bbd/independncia_do_brasil_texto.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/tutorial_axure_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8f913f-3240-4477-8a45-c0c6c1d19f7e/formato_poliza_de_cheque_para_descar.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/81785948777.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/ram_expander_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/24272122673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259f7ab4-f7cc-44ce-a584-d994c30b0937/poratijibuki.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/gelatin_sheets_powder_conversion.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/first_grade_math_homework_pages.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_off0000cbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEF 5140 bytes
SHA-256: 9f1e99bb3ccd99b5bc82c977a2ed39d3394003080981e71b04131cbddcd4e4dd
font_01_sfnt_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 11228 bytes
SHA-256: fb671d7e7d0f6051d5cd214660b756133b965416eb396d1f96a5ea7c022d3c25
font_02_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176