Malicious PDF — malware analysis report

Static analysis result for SHA-256 4978b1e94d525dc0…

MALICIOUS

PDF

43.0 KB Created: 2020-10-29 05:14:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e9922ed193adf401279869b54d2ae8d4 SHA-1: d59c20e9ab7cba48e9fcc10f4299384d2679a256 SHA-256: 4978b1e94d525dc093f0ca0930da1669d315376cbffa0e0f58dada262543e32c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with the primary one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, likely for SEO manipulation or to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the primary malicious URL.

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=deadwood+reservoir+lodge In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f91f5b9ccd22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5f94a2bda7e39.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/1/0479/1916/9702/files/xotesifiga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8116/3438/files/law_salary_guide_nz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7807/4012/files/sobupibodopobozibolix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2722/5506/files/lulizisejar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7938/4736/files/eastern_american_toad_tadpoles.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/xopitifiwepawokenabale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe1f5ed-e758-4b04-ba6b-db6e0c431f50/81517730048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed67074-677c-412f-8f3e-2947bbb86261/creature_codex_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/7756/7132/files/alarm_clock_in_android_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7152/7319/files/pes_17_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/desktop_engineer_interview_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4833/5022/files/olfina_gray_mane_and_jon_battle_born.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce7f8af-4112-40dd-88ad-3965ffecd352/rikasukuvemefikivi.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/wiwovuwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7808/1959/files/amazon_fire_7_tablet_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4812/2546/files/informed_consent_action_network_credibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff170872-0570-4437-b269-05313bb72885/zozelotoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/97929878717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7888/4759/files/satellite_communication_network.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7888/4759/files/80872345069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb92948-b2ae-4e0b-bf25-181749ee3834/49027873503.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_off0000689a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x689A 5144 bytes
SHA-256: 1231b1304b85470321a552d62b004ab612bb28e4bf9ac65885d837d840a7e4d6
font_01_sfnt_off00007a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A48 10824 bytes
SHA-256: 860fabf4959a3e560ef8a1c64f808770b7ba645fef201fcb46094b0b24d326b0

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