Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4f7e0a830c3cfc…

MALICIOUS

PDF

73.9 KB Created: 2021-01-06 15:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: eef50cfafe04ac9e4261a05b2946e2ab SHA-1: 7477105041c0148e97777fc39c7bf5042a40073f SHA-256: 4c4f7e0a830c3cfcaa4380a2f5a9d45f3cb3cbc1e0f6b75fb45eb172da32d783
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://ggtraff.ru/aws?utm_term=acer+aspire+5742+software`. The presence of a 'download button' heuristic further suggests a lure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the overall pattern points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://ggtraff.ru/aws?utm_term=acer+aspire+5742+software In PDF document text
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fed5fc0c07fa.pdfIn PDF document text
    • https://cdn.sqhk.co/wozulifudon/iEijfjj/game_snake_worms_zone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_5fa0c68b4c907.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/MNhc5jd/29289018718.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/hjdjeCL/brick_crushing_machine_hire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b53eb38-594a-454a-a43b-539c132d651a/78060866727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba27cb45-a346-4b39-91da-6ef1510c5a86/microsoft_black_and_white_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cecacda-4d47-4be6-9046-3d3330a6ca5d/crying_black_guy_meme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0241868-e530-4d30-95b3-355677cf0e82/dosemidinim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe109b4-09e7-4c6d-9ee6-5f87537a30cc/lanocreme_soothing_eye_serum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea43ba18-8bc5-4cd1-867a-6c430b47660e/58871879288.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/31788445924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a78a04-95e2-4ffa-b205-987874e1ca4b/the_rose_of_paracelsus_wiki.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_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 5480 bytes
SHA-256: 53d12ede09080e91d8db7f49b24afe77ff2f1d9ed14fba0680a9c01c9a890999
font_01_sfnt_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 10940 bytes
SHA-256: adf753ac975efaffc0838d761b01d0a3e65a449a7931591531303b00315cb3ea

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