Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc641dc07f31da1…

MALICIOUS

PDF

42.4 KB Created: 2020-10-25 22:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 86249c881033aa03b941159346ba20dd SHA-1: 80f3bd33ac0a2b09363da2973aec133d6d2c5648 SHA-256: 7cc641dc07f31da14d6f83dcc2c1cd62edebfe4cda53d08fe6c45828639bade5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector URL known for malicious activity. The document body, though partially corrupted, suggests a lure related to educational materials, likely to trick users into visiting the malicious link. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points towards a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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?keyword=cours+d%2527+alphab%25C3%25A9tisation+fran%25C3%25A7ais+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5f8a1143edfa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f93f68595756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5f8bf132c5a48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_5f94a16448cc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_5f9109193befe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5f881d620c171.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0087/5173/files/20828893958.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8691/3442/files/76923949044.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1543/7977/files/39618371915.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2828/2529/files/free_fire_apk_vision.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9376/3266/files/mahalakshmi_ashtothram_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f16f604a-72c5-480a-9394-c674fffa8f65/xutisewuroro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdf14b6-a0fd-4b94-bf3c-5663d78644df/talavexovefidoralute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a050089b-cb60-42d7-844f-561bb87ae223/car_mechanic_simulator_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baadcc9f-e328-4364-8b21-15639f4e0c4b/45072537808.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/automobile_engineering_subjects.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/25288727621.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/nemaninawezefudunul.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/aws_developer_certification_questions.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_off00006243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6243 5532 bytes
SHA-256: 6f82487e9e6b475f30ca4b5248c51480fbcd3aee4e5f25eff7cb79ce3949f620
font_01_sfnt_off000074ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74CA 11816 bytes
SHA-256: 63b7949d9c9cda23b117ebbb83d52b17eba85c1bf22aea99d95ecabb160fdc18

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