Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d888e2295a7d205…

MALICIOUS

PDF

65.8 KB Created: 2020-11-13 09:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e2a12f1dc3cf67f43a741c50d86b7cfb SHA-1: eefc64d2d5e7ff04ccb4cf1893806bf5a1949b54 SHA-256: 2d888e2295a7d205b537100d75f6a27fcbec48eaaca12443a16b01669abc1d4b
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of numerous external PDF links suggest a link farm or redirection scheme designed to lead users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=oxford+printable+index+cards+template In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_5f8e784d02ed2.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/vifotatilaw.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/1864496.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/mifunikifabupa-senazu-remirem-ruvefir.pdfIn PDF document text
    • https://kobuxomibusopi.weebly.com/uploads/1/3/4/6/134609859/nevifixafekudufowum.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/mubefula/find_and_replace_google_docs_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45efaf5-ecb1-406a-a613-162d7acd50d1/bupukorobavibitadugezip.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/sennheiser_hd_202_ii_professional.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/push_to_start_kit_install.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7a075e-7d69-49dc-ad80-4794915005d5/24930204018.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/boston_market_half_chicken_meal_price.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/avoidance_avoidance_conflict_mcat.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/aloha_contract_services_kauai.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_off0000c4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C6 5536 bytes
SHA-256: a8cbdbfb18ddd53f162dfa37832a035d087819a4912cbaa5bb5a45912ee8dacc
font_01_sfnt_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 10128 bytes
SHA-256: 62a970a891680e47c2478f06c0136a892578fb470a9bce78a0bb7f938f13ef61

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