Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a9ecac47d46767…

MALICIOUS

PDF

52.5 KB Created: 2020-10-28 15:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3a9af444e91c5d29e738c5e6f03dab7c SHA-1: d770d378e0df9be50f9bd608daed473efe604c2b SHA-256: 57a9ecac47d46767fca44713b53a1f4796cbc9400134b9de491fa6f764a8c9f2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it's a malicious redirector link farm. The primary malicious URL identified is 'https://ggtraff.ru/strik?keyword=keurig+k-elite+c+single+serve+coffee+maker', which likely leads to further malicious activity. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/strik?keyword=keurig+k-elite+c+single+serve+coffee+maker In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_5f935a9083693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5f922b4375243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f9924319fbe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_5f97e5c29a896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f932e32e7a10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f88a6f6d469c.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/1/0432/7289/6672/files/weduzalubevuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/2265/9996/files/amber_alert_history_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8234/1280/files/which_of_the_following_is_a_characteristic_of_cnidarians.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4512/8858/files/cursive_handwriting_worksheets_6th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0905/2319/files/nojaxigoresiga.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/the_squat_challenge_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3190/8511/files/add_signature_block_to_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0748/1258/files/muwika.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/cana_caballo_de_troya_9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4114/3454/files/formed_elements_of_blood_percentage.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/gidotumozumuxixaxesize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3516/2786/files/jutenobur.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/karakteristik_bakteri_enterobacter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6006/7991/files/commas_in_compound_sentences_worksheets_5th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9303/1080/files/touchstone_english_book_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7125/0333/files/blown_to_bits_chapter_7.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/7123566959.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_off00008e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0B 5324 bytes
SHA-256: 837ee11400285299a24b0eab30575fbc7972d56c00c887ea5769f55ed5e9c7d2
font_01_sfnt_off0000a02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA02E 10668 bytes
SHA-256: ae8a81c47096189d342228f96dd39c8da8dde3eec5f43ba9bbfa1db82c7b08b1

Open this report in the interactive analyzer, or submit your own file for analysis.