Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d5bffed6705cb7…

MALICIOUS

PDF

65.7 KB Created: 2020-12-22 04:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 428262256fc0c8a79c7bd90ffcf52cb3 SHA-1: e2aa20663259a9b8407701ec6c6140e34ea3cdd7 SHA-256: a9d5bffed6705cb7d9358b251c0b3e8f4eb0e231deeb5c1ac072937a9e288ad1
194 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 for a malicious redirector link pointing to 'ggtraff.ru'. This URL is also flagged as a lure for free-download phishing. ML classification and ClamAV also strongly indicate maliciousness, likely a phishing or trojan payload delivery.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=caulfield+grammar+school+uniform+elc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489586/normal_5fa990b7a6760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5f8fa382147a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5fdf8c94d1236.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413986/normal_5fd04a0615e95.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/745deef1-50ba-45b0-a58f-3cb215286d3b/81837740027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee6ad0b-4c39-4ce6-ad5a-bd00df896816/can_you_be_allergic_to_silicone_breast_implants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27bc9d1-a340-4c36-a35d-3d31b4fdfceb/sybex_ccna_study_guide_7th_edition_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/fakagilonupakokesiv.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/rimland_theory_definition_geography.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/wordly_wise_3000_book_8_lesson_14.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/jojif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55b955c-d15a-4a77-9c57-bfaef7a32779/87815449044.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_off0000c559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC559 5340 bytes
SHA-256: 3dad2012b7d965fdb5c751d3ed9477bcac6febb2104bd00832192529e21a0fe5
font_01_sfnt_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 10224 bytes
SHA-256: c29f39e27701f0aa453f35b85c5baed2295ea94958b15b686a72626e88640a3c

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