Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8ce20bb753eef4…

MALICIOUS

PDF

44.3 KB Created: 2020-10-29 13:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bc5454534ccbaad89484723a0f42fb79 SHA-1: e0bdb58d46fc457a1ddf49ed6f6bf91be551757e SHA-256: 3a8ce20bb753eef42ca30493a397d32092f83bdc3d3e2f1e1a6426d4e89e3cb3
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'creekland middle school' and includes the malicious URL, suggesting a lure to phishing or malware distribution sites. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a link farm or SEO poisoning attack.

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://gettraff.ru/aws?keyword=creekland+middle+school In PDF document text
    • https://xabopefasuliwik.weebly.com/uploads/1/3/4/4/134445681/4729956.pdfIn PDF document text
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/sejadiguv.pdfIn PDF document text
    • https://gosedizomomusuw.weebly.com/uploads/1/3/4/3/134313056/3024232f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404984/normal_5f94d16d4c482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5f9386c0d4aaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_5f89e5c049d5e.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/5051083.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/782112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejifavo/sql_antipatterns_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e3f456-2cd0-466c-80a2-447d1cbc2a70/xenobanozazebaxavupewub.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/ayurvedic_dosha_questionnaire.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/86567967600.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/black_and_white_books_decor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96da370c-1b5c-437b-bab4-7041488c6493/67479465248.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/lazamexafolaromokuwonole.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/18143946473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/488fac10-161e-4ab9-a150-c617966b7152/novels_vs_factual_books.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/xigug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff22774-4ccd-4ffe-af45-cb670c60f408/30030570315.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/active_and_passive_fire_protection.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/basta_de_historias_andres_oppenheimer_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/cancer_de_prostata_tratamiento_hormonal.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/river_maps_of_india.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/kimataxigeralomugaz.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/boost_juice_bar_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/aha_bls_manual_2015.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_off00006fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE3 5148 bytes
SHA-256: f6639c40db3a37eb41f19b0fb03a69db73a74b606be90d1d6d7e4253b50617ec
font_01_sfnt_off00008136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8136 10088 bytes
SHA-256: 1d305a97ce36520d254e503d0e60fabb8837a81543be83ca08c163b6e1c6109b

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