Malicious PDF — malware analysis report

Static analysis result for SHA-256 236708cec0db2f2b…

MALICIOUS

PDF

65.8 KB Created: 2020-10-29 12:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c706eb0af7d027687fbe9bb033f6189a SHA-1: 316a9be8fe1dbed156da79146296c852011944eb SHA-256: 236708cec0db2f2b65370f0801113df40ab923640ed6e0fe56c0cf00bc150748
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign-looking PDFs hosted on Shopify and AWS. However, one critical link redirects to `gettraff.ru`, a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a malicious redirector indicates an attempt to lead the user to a harmful site, likely for further exploitation or phishing.

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=2004+mach+1+transmission In PDF document text
    • https://mizuzakulidux.weebly.com/uploads/1/3/4/4/134471721/vovaxezu.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/wuzugozavesijap-xukurejijulute-rixasox-bumisewos.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/1/0502/3390/1256/files/clean_master_apk_for_android_jelly_bean.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7493/7532/files/nhvr_basic_fatigue_management_accreditation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/50712536583.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4583/8248/files/mathematical_analysis_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/tactics_for_listening_expanding_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/22456278914.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7717/9294/files/simply_clear_cbd.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/aws_big_data_certification_dumps.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/bar_trivia_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4491/1269/files/5119390457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b21bbd1-2bea-4f59-a641-96b7124098b6/degubirevakunuvigo.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/kubutefababobuzaxifo.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/cancionero_baena.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/fevizerurojidasitu.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/zejesulikumadopasoxiwud.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/45656328478.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/basic_korean_language_learning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad85a2f9-930e-4036-a0f1-d920aa9fbc2c/kate_spade_cameron_street_medium_harmony_black.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABA2 5324 bytes
SHA-256: 28fa2bb9bd9dab455baad69d6b79ad09f6cc18faac5f935e6fe9fae65c4b0452
font_01_sfnt_off0000bd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD99 11328 bytes
SHA-256: 01e61f32e7b338da3b3dad30c5467164dd014cc263e12515cf06b99129f51efe
font_02_sfnt_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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