Malicious PDF — malware analysis report

Static analysis result for SHA-256 af899f1dbd35a2e5…

MALICIOUS

PDF

94.8 KB Created: 2020-12-16 02:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9508e1d4331c556e2cfcffa238501016 SHA-1: 77b6660ab704cd197e7d3104082bfe4aff867541 SHA-256: af899f1dbd35a2e5bc06dfff6ef4283f49a61f6bfe29781dd0f77dd0c2ee83a5
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external resources, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM. The primary malicious URL identified is https://cctraff.ru/aws?utm_term=passive+form+english+syntax, which likely serves as a redirector to further malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

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.
  • 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://cctraff.ru/aws?utm_term=passive+form+english+syntax In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476930/normal_5fa6e29bbf10a.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/kopiwu_gotatumeturi_bovejixegas_vivikow.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/nuxosiw_kifizedawate_ladarefun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f8734aa27d0d.pdfIn PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/lulur-ganizig-zoxige-veven.pdfIn PDF document text
    • https://mipoxijal.weebly.com/uploads/1/3/4/7/134709746/6bd535ca5dd7d.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/56a75e39-4bd7-401d-a6b1-ef29b1f56c53/infinite_baffle_subwoofer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1599abb-9a4b-47d0-ad91-6004e2da741b/51121079110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ca1caa-7fd5-44fa-baa0-c60b4eb08f5b/28118736105.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc39e3c5e8e827d429ee1bf/t/5fce10bef94b6402b2412188/1607340223854/nascar_race_sunday_lineup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796e1897-c372-46c8-8e56-2c43d59b5054/alien_invasion_game_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b020e97-223f-45e4-9fbb-85eb6c4d2511/78180296228.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf3367affad1251da8abe8/t/5fd6b4b55488895576b88e1e/1607906485789/apk_editor_pro_1._9._10_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b67ebfd-bd62-46ad-abe2-ab68b74e8af8/zinuroboxifepafudo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce140ad16a7702df016329/t/5fd62b7b102ca46975dc00d5/1607871355731/carteles_informativos_para_nios_de_primaria.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf48cfbc819f1cf4ce9f24/1606371536532/kaze_to_ki_no_uta_manga.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_off00013396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13396 5412 bytes
SHA-256: adb74fdfc62d2a4a9b5aa309d17819c2ca3c90bf26c769f075154bff6e4e586d
font_01_sfnt_off000145e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E8 11940 bytes
SHA-256: 7856e9c4b872fc4136e36795d0a637c08d08d6b198d2b1908cddbee1b9e6a363

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